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gpt-oss-20b

OpenAIfamily · gpt-ossdevelopers.openai.com/api/docs/models/gpt-oss-20

Medium-sized open-weight model for low latency

Open in Graph
data quality78

Updated 5 h ago · first seen 11 Sept 2026

model_01M293VC6B06HH77JHPAVH04D2

Overview

Identity

Canonical model
Yesidentity confidence: mediumOne row per real model release. Artifacts (checkpoints, quantisations, conversions) and folded evaluation variants point here.
Official checkpoints
official_checkpoints = hf_repo identifiers carried by the model itself; artifacts are separate entities pointing here through canonical_id.
Artifacts
1 quantization0 official · 1 third-partySeparate entities (checkpoint · quantization · conversion · packaging) pointing to this model through canonical_id.
Provider deployments
3
API aliases
gpt-oss-20bgpt-oss-20b-lowopenai/gpt-oss-20bIdentifiers under which providers and evaluators refer to this model.
Folded evaluation variants
1Effort / thinking variants (…-high, …-non-reasoning) are result configurations of this model, not separate models. Their old URLs redirect here.

Openness

Open weights— weights downloadable under Apache-2.0; commercial use allowed; redistribution allowed; derivatives allowed; 4 dimensions unknown.

Weights downloadable under a permissive or Creative Commons licence allowing commercial use; code or data may be missing.

  • Weights

    Yes

  • Inference code

    —

  • Training code

    —

  • Training data

    —

  • Dataset

    —

  • Commercial use

    Yes

  • Redistribution

    Yes

  • Derivatives

    Yes

Licence: Apache License 2.0 (permissive · SPDX Apache-2.0 · stated as “apache-2.0”)

dimensions marked null are unknown, not false

Key facts

Release date

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 10 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

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

Source:OpenAI Platform docsT1observed 15 h agohigh

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

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 15 h agomedium

API model id

Source:OpenAI Platform docsT1observed 15 h agohigh

Openrouter id

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Architecture

Architecture

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 14 h agomedium

Model type

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 14 h agomedium

Parameters

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 15 h agomedium

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Weights dtype

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 14 h agomedium

File size

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 14 h agomedium

Library name

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 14 h agomedium

Pipeline tag

Source:Hugging Face Hub (public pages, model cards, papers)T2observed 15 h agomedium

Hugging Face repo

Source:OpenRouter public model & pricing listingT2observed 15 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 15 h agomedium

Max output

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Benchmarks30

Compare with another model →

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

Benchmark results grouped by comparability group
Benchmark · groupBest scoreTrustConfigurationResultsvs leaderEvaluatedSource
Terminal-Benchagentic · accuracy · variant=v2.1 · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisvariantv2.1reasoning_efforthighconditions differ across rows → partially comparable2non-primary groupobs. 12 Sept 2026artificialanalysis.aiT2
Terminal-Benchagentic · accuracy · variant=v4.0 · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisvariantv4.0reasoning_efforthighconditions differ across rows → partially comparable2non-primary groupobs. 12 Sept 2026artificialanalysis.aiT2
Terminal-Benchagentic · accuracy · variant=hard · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisvarianthardreasoning_efforthighconditions differ across rows → partially comparable4−55.3 ptvs gpt-5.6-solobs. 12 Sept 2026artificialanalysis.aiT2
τ²-benchagentic · pass^1 · variant=Telecom · evaluator=Artificial AnalysisIndependentevaluatorArtificial AnalysisvariantTelecomreasoning_efforthighconditions differ across rows → partially comparable2non-primary groupobs. 12 Sept 2026artificialanalysis.aiT2
τ²-benchagentic · pass^1 · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysis2−38.9 ptvs Z.ai GLM 5.2obs. 11 Sept 2026artificialanalysis.aiT2
SciCodecoding · accuracy · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisreasoning_efforthighconditions differ across rows → partially comparable2−24.2 ptvs Claude Fable 5.1obs. 12 Sept 2026artificialanalysis.aiT2
Artificial Analysis Intelligence Indexcomposite · indexIndependentreasoning_effortlowversion4.3conditions differ across rows → partially comparable4−43.4vs Claude Fable 5.1obs. 12 Sept 2026artificialanalysis.aiT2
IFBenchinstruction-following · accuracy · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisreasoning_efforthighconditions differ across rows → partially comparable4−18.2 ptvs Grok 4.3obs. 12 Sept 2026artificialanalysis.aiT2
Humanity's Last Examknowledge · accuracy · evaluator=Artificial AnalysisIndependentevaluatorArtificial Analysisreasoning_efforthighconditions differ across rows → partially comparable4−48.2 ptvs Claude Fable 5.1obs. 12 Sept 2026artificialanalysis.aiT2
GPQA Diamondreasoning · accuracy · variant=Diamond · evaluator=Artificial AnalysisIndependentevaluatorArtificial AnalysisvariantDiamondreasoning_efforthighconditions differ across rows → partially comparable2non-primary groupobs. 12 Sept 2026artificialanalysis.aiT2
GPQA Diamondreasoning · accuracy · variant=GPQA Diamond · evaluator=Artificial AnalysisIndependentevaluatorArtificial AnalysisvariantGPQA Diamond2−27.5 ptvs gpt-6-astraobs. 11 Sept 2026artificialanalysis.aiT2

Current rows only, grouped by benchmark → canonical metric → comparability group (task configuration). Effort variants folded into this model appear as rows of the same group. 30 current rows in total. “vs leader” compares with the current leader of the benchmark's primary group only; other groups are not directly comparable. Comparability rules →

Providers & Pricing5

All offers in the price terminal →
Provider deployments, cheapest output first
ProviderContextInput / 1MCached inOutput / 1MNative unitsStatusObservedSource
OpenAI APIcheapest outputopenai/gpt-oss-20b131.1Kout 118K$0.03—active6 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-oss-20b131.1Kout 118K$0.03—active2 h agosince 12 Sept 2026openrouter.aiT2
OpenAI APIopenai/gpt-oss-20b:batch131.1Kout 118K——active6 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-oss-20b:batch131.1Kout 118K——active2 h agosince 12 Sept 2026openrouter.aiT2
GroqCloudopenai/gpt-oss-20b131.1Kout 65.5K—output_tokens_per_second=1000active2 h agosince 11 Sept 2026console.groq.comT1

USD per 1M tokens as published by each provider; native units (per-request fees, flex/priority tiers) are kept verbatim. Rows are append-only — every price change is kept in the history below. Cost of a workload →

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 3 providers

Output price history of gpt-oss-20b$0$0.10$0.20$0.30$0.40Sept 26Sept 26Sept 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 2026OpenRouter: first observed → $0.13 · 12 Sept 2026OpenRouter: $0.13 → $0.20 · 12 Sept 2026
  • OpenAI API
  • GroqCloud
  • OpenRouter
  • OpenRouter$0.13 → $0.2012 Sept 2026
  • OpenRouterfirst observed $0.1312 Sept 2026
  • 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 3 providers

Input price history of gpt-oss-20b$0$0.02$0.04$0.06$0.08$0.10Sept 26Sept 26Sept 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 2026OpenRouter: first observed → $0.03 · 12 Sept 2026OpenRouter: $0.03 → $0.05 · 12 Sept 2026
  • OpenAI API
  • GroqCloud
  • OpenRouter
  • OpenRouter$0.03 → $0.0512 Sept 2026
  • OpenRouterfirst observed $0.0312 Sept 2026
  • 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 (7)
  • Estimated, not measured: weights = parameters × bytes/param × 1.15 runtime overhead (or the observed artifact file size when one is recorded).
  • bytes/param: 4bit = 0.5, 8bit = 1.0, fp16 = 2.0 (uniform quantization, no per-layer exceptions).
  • KV cache: 2 × layers × kv_heads × head_dim × 2 bytes × context × batch when the architecture is known; otherwise 0.5 GB per 8 192 tokens (× batch), 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).
  • Multi-GPU: device memories are summed; interconnect bandwidth, tensor-parallel replication and pipeline bubbles are not modelled.

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

Versions & Artifacts1

Version history

Context windowfirst observation only

11 Sept 2026current

Knowledge cutofffirst observation only

11 Sept 2026current

Licensefirst observation only

11 Sept 2026current

Max outputfirst observation only

11 Sept 2026current

Opennessfirst observation only

11 Sept 2026current

Parametersfirst observation only

11 Sept 2026current

Each hop is a claim: click a value for its source, tier and observation time. Nothing is overwritten — a new observation closes the previous claim.

Artifacts 1

quantization 1

Papers1

Timeline19

Full timeline →

Change history

Temporal, append-only claims: a new observation closes the previous claim instead of overwriting it. Rewind the record with the as-of picker.
2 claims · 1 propertiesShow all properties

Aa median output tokens per secondmetric.aa_median_output_tokens_per_second2

Claim history for Aa median output tokens per second
ValueValid from → toStatusSourceConfidenceExtractor
179.4 → currentcurrentArtificial AnalysisT2mediumdeterministic
224.6 → currentcurrentArtificial AnalysisT2mediumdeterministic

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

45

Source tiers

T1T25 / 40

Freshest observation

5 h ago

Conflicts

None

Source documents 9

Source documents
SourceDocumentTypeTierLast observedSnapshots
OpenAI Platform docsdevelopers.openai.com/api/docs/models.md model_docsT1· Official2 h ago1
Groq — docs & pricingconsole.groq.com/docs/models model_docsT1· Official2 h ago5
OpenRouter public model & pricing listingopenrouter.ai/api/v1/models catalogueT2· Quality secondary2 h ago11
Artificial Analysisartificialanalysis.ai/leaderboards/models leaderboardT2· Quality secondary5 h ago2
Hugging Face Hub (public pages, model cards, papers)huggingface.co/models?author=openai&p=0&sort=downloads listingT2· Quality secondary5 h ago7
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-20b/raw/main/README.md model_cardT2· Quality secondary8 h ago1
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-safeguard-20b model_pageT2· Quality secondary9 h ago4
Hugging Face Hub (public pages, model cards, papers)huggingface.co/openai/gpt-oss-20b model_pageT2· Quality secondary9 h ago5
Hugging Face Hub (public pages, model cards, papers)huggingface.co/mlx-community/gpt-oss-20b-MXFP4-Q8 model_pageT2· Quality secondary9 h ago4

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 →