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gpt-oss-20b

OpenAIdevelopers.openai.com/api/docs/models/gpt-oss-20

Medium-sized open-weight model for low latency

Open in Graph
data quality78

Updated 6 h ago · first seen 11 Sept 2026

model_01M293VC6B06HH77JHPAVH04D2

Overview

Identity

Identity block not returned by the API for this entity.

Openness

Openness not classified yet — no sourced evidence to place this model in the ontology.

Key facts

Release date

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 8 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Official page
developers.openai.com/api/docs/models/gpt-oss-20b

Source:OpenAI Platform docsT1observed 14 h agohigh

Model card
huggingface.co/openai/gpt-oss-20b

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

API model id

Source:OpenAI Platform docsT1observed 14 h agohigh

Openrouter id

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Architecture

Architecture

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Model type

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Parameters

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Weights dtype

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

File size

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Library name

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Pipeline tag

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 13 h agomedium

Hugging Face repo

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Capabilities

Modalities

Modalities
text
Input
text
Output
text

Capabilities

  • Tool calling

    Yes

    OpenRouter public model & pricing listing · T2

  • Structured output

    Yes

    OpenRouter public model & pricing listing · T2

  • Reasoning

    Yes

    OpenRouter public model & pricing listing · T2

  • Vision

    Unavailable

  • Audio

    Unavailable

  • Fine-tuning available

    Unavailable

Context window

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Max output

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 13 h agomedium

Benchmarks9

Compare with another model →

Comparable same task and conditions · Partially comparable same task, conditions differ (effort, temperature, judge) · Not comparable different variant or metric

No benchmark results recorded

Results appear when a tier 1–3 source publishes them; we never copy scores without a source.

Providers & Pricing3

All offers in the price terminal →
Current prices per 1M tokens
ProviderInput / 1MOutput / 1MCached inBatch in / outContextObservedSource
OpenAI APIopenai/gpt-oss-20b$0.03$0.13$0.03—131.1K4 h agoopenrouter.aiT2
OpenAI APIopenai/gpt-oss-20b:batch$0.05$0.20——131.1K4 h agoopenrouter.aiT2
GroqCloudopenai/gpt-oss-20b$0.075$0.30——131.1K6 h agoconsole.groq.comT1

USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.

Price history

Step lines per provider; amber markers are recorded changes. Click a marker or a row for the evidence behind that price.

Output price · USD / 1M tokens 2 providers

Output price history of gpt-oss-20b$0$0.10$0.20$0.30$0.40Sept 26Sept 26Sept 26OpenAI API: first observed → $0.13 · 11 Sept 2026OpenAI API: $0.13 → $0.20 · 11 Sept 2026GroqCloud: first observed → $0.30 · 11 Sept 2026
  • OpenAI API
  • GroqCloud
  • GroqCloudfirst observed $0.3011 Sept 2026
  • OpenAI API$0.13 → $0.2011 Sept 2026
  • OpenAI APIfirst observed $0.1311 Sept 2026

Input price · USD / 1M tokens 2 providers

Input price history of gpt-oss-20b$0$0.02$0.04$0.06$0.08$0.10Sept 26Sept 26Sept 26OpenAI API: first observed → $0.03 · 11 Sept 2026OpenAI API: $0.03 → $0.05 · 11 Sept 2026GroqCloud: first observed → $0.075 · 11 Sept 2026
  • OpenAI API
  • GroqCloud
  • GroqCloudfirst observed $0.07511 Sept 2026
  • OpenAI API$0.03 → $0.0511 Sept 2026
  • OpenAI APIfirst observed $0.0311 Sept 2026

Hardware fit37

Estimated

37 of 37 device × quantization combinations fit.

Run locally: your machine →
Estimated hardware fit
HardwareQuantizationDevice memoryEst. memoryFits
Apple M3 Ultra4bit—12.5 GB est.Yes
Mac Studio (Apple M5 Ultra)4bit—12.5 GB est.Yes
Apple M2 Ultra4bit—12.5 GB est.Yes
Apple M1 Ultra4bit—12.5 GB est.Yes
Apple M3 Max4bit—12.5 GB est.Yes
Apple M4 Max4bit—12.5 GB est.Yes
Mac Studio (Apple M5 Max)4bit—12.5 GB est.Yes
MacBook Pro (Apple M5 Max)4bit—12.5 GB est.Yes
Apple M2 Max4bit—12.5 GB est.Yes
Apple M1 Max4bit—12.5 GB est.Yes
Apple M4 Pro4bit—12.5 GB est.Yes
Mac mini (Apple M5 Pro)4bit—12.5 GB est.Yes
MacBook Pro (Apple M5 Pro)4bit—12.5 GB est.Yes
Apple M3 Pro4bit—12.5 GB est.Yes
Apple M1 Pro4bit—12.5 GB est.Yes
Apple M2 Pro4bit—12.5 GB est.Yes
Apple M44bit—12.5 GB est.Yes
iMac (Apple M4)4bit—12.5 GB est.Yes
Mac mini (Apple M6)4bit—12.5 GB est.Yes
MacBook Air (Apple M5)4bit—12.5 GB est.Yes
MacBook Pro (Apple M5)4bit—12.5 GB est.Yes
Apple M24bit—12.5 GB est.Yes
Apple M34bit—12.5 GB est.Yes
Apple M14bit—12.5 GB est.Yes
NVIDIA GeForce RTX 30904bit24 GB12.5 GB est.Yes
NVIDIA GeForce RTX 40904bit24 GB12.5 GB est.Yes
NVIDIA GeForce RTX 50904bit32 GB12.5 GB est.Yes
NVIDIA A100 80GB4bit80 GB12.5 GB est.Yes
NVIDIA H100 SXM4bit80 GB12.5 GB est.Yes
NVIDIA H100 NVL4bit94 GB12.5 GB est.Yes
NVIDIA DGX Spark4bit128 GB12.5 GB est.Yes
NVIDIA H2004bit141 GB12.5 GB est.Yes
NVIDIA H200 NVL4bit141 GB12.5 GB est.Yes
NVIDIA B2004bit180 GB12.5 GB est.Yes
AMD Instinct MI300X4bit192 GB12.5 GB est.Yes
AMD Instinct MI325X4bit256 GB12.5 GB est.Yes
NVIDIA DGX B2004bit1,440 GB12.5 GB est.Yes
Assumptions (6)
  • Estimated, not measured: weights = parameters × bytes/param × 1.15 runtime overhead.
  • bytes/param: 4bit = 0.5, 8bit = 1.0, fp16 = 2.0 (uniform quantization, no per-layer exceptions).
  • KV cache approximated at 0.5 GB per 8 192 tokens of context, independent of architecture (GQA/MLA models need less).
  • A model 'fits' when the estimate is at most the device memory minus 2 GB reserved for the OS and framework.
  • Mixture-of-experts models are estimated on total parameters (all experts must be resident); active parameters are ignored.
  • Device memory uses the largest configuration when several are listed (e.g. Apple silicon tiers).

Lineage

Open in Graph →
Explicit derived_from / fine_tuned_from / distilled_from relations stated by sources; artifacts collapsed by kind.
DESCENDANTS 1 · ARTIFACTSgpt-oss-safeguard-20b21.5Bgpt-oss-safeguard-20b — 21.5B1 quantizationartifacts · collapsed1 quantization — artifacts · collapsedgpt-oss-20b20.9B params · this modelgpt-oss-20b — 20.9B params · this model

Papers1

Timeline15

Full timeline →

Change history39

Temporal, append-only claims: a new observation closes the previous claim instead of overwriting it. Rewind the record with the as-of picker.

Viewing AI Atlas as of 12 Mar 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.

Back to today →

gpt-oss-20b was not yet in AI Atlas on 12 Mar 2026

First seen 11 Sept 2026. Nothing is inferred backwards: no attribute is shown for dates before the first observation.
39 claims · 36 properties

Release daterelease_date3

Claim history for Release date
ValueValid from → toStatusSourceConfidenceExtractor
5 Aug 2025 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic
4 Aug 2025 → supersededHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic
5 Aug 2025 → supersededOpenRouter public model & pricing listingT2mediumdeterministic

Opennessopenness1

Claim history for Openness
ValueValid from → toStatusSourceConfidenceExtractor
open-weights → currentcurrentOpenAI Platform docsT1highdeterministic

Licenselicense1

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ValueValid from → toStatusSourceConfidenceExtractor
apache-2.0 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Architecturearchitecture1

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ValueValid from → toStatusSourceConfidenceExtractor
GptOssForCausalLM → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Parametersparameter_count1

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ValueValid from → toStatusSourceConfidenceExtractor
20.9B → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Context windowcontext_length1

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ValueValid from → toStatusSourceConfidenceExtractor
131.1K tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Max outputmax_output_tokens1

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ValueValid from → toStatusSourceConfidenceExtractor
118K tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Knowledge cutoffknowledge_cutoff1

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ValueValid from → toStatusSourceConfidenceExtractor
Jun 2024 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Modalitiesmodalities1

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ValueValid from → toStatusSourceConfidenceExtractor
text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Input modalitiesmodalities_input1

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ValueValid from → toStatusSourceConfidenceExtractor
text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Output modalitiesmodalities_output1

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ValueValid from → toStatusSourceConfidenceExtractor
text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tokenizertokenizer1

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ValueValid from → toStatusSourceConfidenceExtractor
GPT → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

API model idapi_model_id1

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ValueValid from → toStatusSourceConfidenceExtractor
gpt-oss-20b → currentcurrentOpenAI Platform docsT1highdeterministic

File sizefile_size_gb1

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ValueValid from → toStatusSourceConfidenceExtractor
13.8 GB → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Hugging Face repohf_repo1

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ValueValid from → toStatusSourceConfidenceExtractor
openai/gpt-oss-20b → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Pipeline tagpipeline_tag1

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ValueValid from → toStatusSourceConfidenceExtractor
text-generation → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Official pageofficial_url1

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ValueValid from → toStatusSourceConfidenceExtractor
https://developers.openai.com/api/docs/models/gpt-oss-20b → currentcurrentOpenAI Platform docsT1highdeterministic

Model cardmodel_card_url1

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ValueValid from → toStatusSourceConfidenceExtractor
https://huggingface.co/openai/gpt-oss-20b → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Downloadsmetric.downloads1

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ValueValid from → toStatusSourceConfidenceExtractor
6,599,829 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Likesmetric.likes2

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ValueValid from → toStatusSourceConfidenceExtractor
5,019 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic
5,018 → supersededHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Descriptiondescription1

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ValueValid from → toStatusSourceConfidenceExtractor
Medium-sized open-weight model for low latency → currentcurrentOpenAI Platform docsT1highdeterministic

Gatedgated1

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ValueValid from → toStatusSourceConfidenceExtractor
No → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Groq model idgroq_model_id1

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ValueValid from → toStatusSourceConfidenceExtractor
openai/gpt-oss-20b → currentcurrentGroq — docs & pricingT1highdeterministic

Hf inference providershf_inference_providers1

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ValueValid from → toStatusSourceConfidenceExtractor
deepinfra, featherless-ai, groq, novita, nscale, ovhcloud, together → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Last modifiedlast_modified1

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ValueValid from → toStatusSourceConfidenceExtractor
2025-08-26T17:25:47+00:00 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Library namelibrary_name1

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ValueValid from → toStatusSourceConfidenceExtractor
transformers → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Aa median output tokens per secondmetric.aa_median_output_tokens_per_second1

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ValueValid from → toStatusSourceConfidenceExtractor
179.4 → currentcurrentArtificial AnalysisT2mediumdeterministic

Downloads all timemetric.downloads_all_time1

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ValueValid from → toStatusSourceConfidenceExtractor
96,531,522 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Model typemodel_type1

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ValueValid from → toStatusSourceConfidenceExtractor
gpt_oss → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Openrouter idopenrouter_id1

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ValueValid from → toStatusSourceConfidenceExtractor
openai/gpt-oss-20b → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Reasoningreasoning1

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ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Structured outputstructured_output1

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ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Supported parameterssupported_parameters1

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frequency_penalty, include_reasoning, logit_bias, logprobs, max_tokens, min_p, presence_penalty, reasoning, reasoning_effort, repetition_penalty, response_format, seed, stop, structured_outputs, temperature, tool_choice, tools, top_k, top_logprobs, top_p → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tagstags1

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ValueValid from → toStatusSourceConfidenceExtractor
transformers, safetensors, gpt_oss, text-generation, vllm, 8-bit, mxfp4 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Tool callingtool_calling1

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ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Weights dtypeweights_dtype1

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ValueValid from → toStatusSourceConfidenceExtractor
BF16, U8 → currentcurrentHugging Face Hub (public pages, model cards, papers)T2mediumdeterministic

Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →

Provenance

Attributed facts

37

Source tiers

T1T25 / 32

Freshest observation

6 h ago

Conflicts

None

Source documents 9

Source documents
SourceDocumentTypeTierLast observedSnapshots
OpenAI Platform docsdevelopers.openai.com/api/docs/models.md model_docsT1· Official4 h ago1
Groq — docs & pricingconsole.groq.com/docs/models model_docsT1· Official6 h ago3
OpenRouter public model & pricing listingopenrouter.ai/api/v1/models catalogueT2· Quality secondary4 h ago7
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-20b/raw/main/README.md model_cardT2· Quality secondary7 h ago1
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-safeguard-20b model_pageT2· Quality secondary7 h ago4
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-20b model_pageT2· Quality secondary7 h ago5
Hugging Face Hub (public pages, model cards, papers)huggingface.co/mlx-community/gpt-oss-20b-MXFP4-Q8 model_pageT2· Quality secondary7 h ago4
Hugging Face Hub (public pages, model cards, papers)huggingface.co/models?author=openai&p=0&sort=downloads listingT2· Quality secondary8 h ago6
Artificial Analysisartificialanalysis.ai/leaderboards/models leaderboardT2· Quality secondary12 h ago1

Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.

Data quality (78/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →