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GPT-5.6 Terra Pro

OpenAIfamily · GPT 5.6

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reas

Open in Graph
data quality50

Updated 5 h ago · first seen 11 Sept 2026

model_01M294WVVC63QWB6R1NVN345RP

Overview

Identity

Canonical model
Yesidentity confidence: mediumOne row per real model release. Artifacts (checkpoints, quantisations, conversions) and folded evaluation variants point here.
Official checkpoints
None recordedofficial_checkpoints = hf_repo identifiers carried by the model itself; artifacts are separate entities pointing here through canonical_id.
Artifacts
None recordedSeparate entities (checkpoint · quantization · conversion · packaging) pointing to this model through canonical_id.
Provider deployments
2
API aliases
openai/gpt-5.6-terra-proIdentifiers under which providers and evaluators refer to this model.
Folded evaluation variants
0Effort / thinking variants (…-high, …-non-reasoning) are result configurations of this model, not separate models. Their old URLs redirect here.

Openness

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

Key facts

Release date

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Knowledge cutoff

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Openrouter id

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Architecture

Tokenizer

Source:OpenRouter public model & pricing listingT2observed 15 h agomedium

Capabilities

Modalities

Modalities
documentimagetext
Input
documentimagetext
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

    Yes

    OpenRouter public model & pricing listing · T2

  • 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

Providers & Pricing4

All offers in the price terminal →
Provider deployments, cheapest output first
ProviderContextInput / 1MCached inCache writeOutput / 1MStatusObservedSource
OpenAI APIcheapest outputopenai/gpt-5.6-terra-pro:batch1.05Mout 128K$0.10—active6 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-5.6-terra-pro:batch1.05Mout 128K$0.10—active2 h agosince 12 Sept 2026openrouter.aiT2
OpenAI APIopenai/gpt-5.6-terra-pro1.05Mout 128K$0.20$2.5active6 h agosince 11 Sept 2026openrouter.aiT2
OpenRouteropenai/gpt-5.6-terra-pro1.05Mout 128K$0.20$2.5active2 h agosince 12 Sept 2026openrouter.aiT2

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 2 providers

Output price history of GPT-5.6 Terra Pro$0$5$10$15Sept 26Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $12 · 11 Sept 2026OpenAI API: $12 → $6 · 11 Sept 2026OpenRouter: first observed → $12 · 12 Sept 2026OpenRouter: $12 → $6 · 12 Sept 2026
  • OpenAI API
  • OpenRouter
  • OpenRouter$12 → $612 Sept 2026
  • OpenRouterfirst observed $1212 Sept 2026
  • OpenAI API$12 → $611 Sept 2026
  • OpenAI APIfirst observed $1211 Sept 2026

Input price · USD / 1M tokens 2 providers

Input price history of GPT-5.6 Terra Pro$0$0.50$1$1.5$2$2.5Sept 26Sept 26Sept 26Sept 26Sept 26OpenAI API: first observed → $2 · 11 Sept 2026OpenAI API: $2 → $1 · 11 Sept 2026OpenRouter: first observed → $2 · 12 Sept 2026OpenRouter: $2 → $1 · 12 Sept 2026
  • OpenAI API
  • OpenRouter
  • OpenRouter$2 → $112 Sept 2026
  • OpenRouterfirst observed $212 Sept 2026
  • OpenAI API$2 → $111 Sept 2026
  • OpenAI APIfirst observed $211 Sept 2026

Versions & Artifacts0

Version history

Context windowfirst observation only

11 Sept 2026current

Knowledge cutofffirst observation only

11 Sept 2026current

Max outputfirst 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 0

No artifact (checkpoint, quantisation, conversion or packaging) points to this model yet.

Timeline4

Full timeline →
  • Listed by providerModelGPT-5.6 Terra ProOpenAI

    OpenRouter lists GPT-5.6 Terra Pro at $1 in / $6 out per 1M tokens

    openrouter
    openrouter.ai
  • Listed by providerModelGPT-5.6 Terra ProOpenAI

    OpenRouter lists GPT-5.6 Terra Pro at $2 in / $12 out per 1M tokens

    openrouter
    openrouter.ai
  • Capabilities changedModelGPT-5.6 Terra ProOpenAI

    GPT-5.6 Terra Pro: modalities changed from ["image", "text"] to ["document", "image", "text"]

    Modalitiesimage, text→document, image, textopenrouter
    openrouter.ai
  • Property changedModelGPT-5.6 Terra ProOpenAI

    GPT-5.6 Terra Pro: modalities input changed from ["image", "text"] to ["document", "image", "text"]

    Input modalitiesimage, text→document, image, textopenrouter
    openrouter.ai

Change history19

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 5 Sept 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.

Back to today →

GPT-5.6 Terra Pro was not yet in AI Atlas on 5 Sept 2026

First seen 11 Sept 2026. Nothing is inferred backwards: no attribute is shown for dates before the first observation.
19 claims · 17 properties

Release daterelease_date1

Claim history for Release date
ValueValid from → toStatusSourceConfidenceExtractor
9 Jul 2026 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Context windowcontext_length1

Claim history for Context window
ValueValid from → toStatusSourceConfidenceExtractor
1.05M tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Max outputmax_output_tokens1

Claim history for Max output
ValueValid from → toStatusSourceConfidenceExtractor
128K tokens → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Knowledge cutoffknowledge_cutoff1

Claim history for Knowledge cutoff
ValueValid from → toStatusSourceConfidenceExtractor
Feb 2026 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Modalitiesmodalities2

Claim history for Modalities
ValueValid from → toStatusSourceConfidenceExtractor
document, image, text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic
image, text → supersededOpenRouter public model & pricing listingT2mediumdeterministic

Input modalitiesmodalities_input2

Claim history for Input modalities
ValueValid from → toStatusSourceConfidenceExtractor
document, image, text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic
image, text → supersededOpenRouter public model & pricing listingT2mediumdeterministic

Output modalitiesmodalities_output1

Claim history for Output modalities
ValueValid from → toStatusSourceConfidenceExtractor
text → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tokenizertokenizer1

Claim history for Tokenizer
ValueValid from → toStatusSourceConfidenceExtractor
GPT → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Descriptiondescription1

Claim history for Description
ValueValid from → toStatusSourceConfidenceExtractor
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

File inputfile_input1

Claim history for File input
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Openrouter idopenrouter_id1

Claim history for Openrouter id
ValueValid from → toStatusSourceConfidenceExtractor
openai/gpt-5.6-terra-pro → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Openrouter listed atopenrouter_listed_at1

Claim history for Openrouter listed at
ValueValid from → toStatusSourceConfidenceExtractor
9 Jul 2026 → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Reasoningreasoning1

Claim history for Reasoning
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Structured outputstructured_output1

Claim history for Structured output
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Supported parameterssupported_parameters1

Claim history for Supported parameters
ValueValid from → toStatusSourceConfidenceExtractor
include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Tool callingtool_calling1

Claim history for Tool calling
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

Visionvision1

Claim history for Vision
ValueValid from → toStatusSourceConfidenceExtractor
Yes → currentcurrentOpenRouter public model & pricing listingT2mediumdeterministic

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

18

Source tiers

T218

Freshest observation

5 h ago

Conflicts

None

Source documents 1

Source documents
SourceDocumentTypeTierLast observedSnapshots
OpenRouter public model & pricing listingopenrouter.ai/api/v1/models catalogueT2· Quality secondary2 h ago11

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

Data quality (50/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →