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GPT-5.1 Codex (high)

deprecated by benchmark source
OpenAI · released 2025-11-13 · 2 offers

Context 400K tokens

Top 2 cheapest providers (Adjusted $/task)

The same list price can give a different adjusted $/task (caching, token efficiency) — click a price for its inputs.

Within the active global provider, residency and confidentiality filters.

#ProviderAdjusted $/task
1Azure
2Azure AI Foundry

Composite

2 of 7 inputs · 1 from the model family6 radar axes: DesignArena's two boards share one

47.0

AA CodingCoding Agent v1.4AA IntelligenceAA AgenticEpoch ECISoftware ECIDesignArenaAA Intelligence: percentile 78DesignArena: percentile 0

AA Coding —Coding Agent v1.4 —AA Intelligence 23.7AA Agentic —Epoch ECI —Software ECI —DesignArena 1033/—

Radar: percentile among all models measured on each input; a gap means not measured.

Benchmark sheet

10 of 140 registered benchmark versions · bars show the percentile among all models measured on each benchmark.

Composite attachments (used in the score, not counted as exact benchmarks):
  • DesignArena Web Apps (agentic) · attached
Compare this model →

Agentic

Coding

Instruction-following

Knowledge

Long-context

  • AA-LCR v1.16569.3%

    AA-LCR v1.1 v1.1 ↗ · Published board — Tests reasoning across multiple long documents with corrected answer keys and grading.

Math

  • AIME 2025 (AA) v20259895.7%

    AIME 2025 (AA) v2025 ↗ · Published board — Advanced mathematical problem solving on AIME I and II 2025.

Reasoning

Science

Tool-use

Vision

Unusual results

1 threshold-crossing signal flagged · 12 eligible benchmark families

How flags are calculated

Heuristic screen, not statistical significance: benchmark families are correlated and source uncertainty is unknown. Peer evidence needs ≥ 20 independently measured matched configurations from ≥ 10 distinct model families. A flag needs a directed population z-score of magnitude ≥ 1.5 and a gap of ≥ 1.5 from the leave-one-benchmark-family-out mean z in the same direction, over ≥ 5 other benchmark families.

  • unusually weak DesignArena Web Apps (agentic) published 2026-09-19
    Why
    Observed: 1033 Elo
    Peer mean 1198.82222 · peer sd 77.91656 · n 45 · families 44
    Directed z -2.128 · baseline z 0.85 · gap -2.978 · profile n 11
    1033 Elomeasured525 battlesobserved 2026-09-19designarena.ai ↗
    Evidence
    Axis: DesignArena Web Apps (agentic) · published 2026-09-19 · Published board
    Exact value: 1033 Elo
    Observed: 2026-09-19 · publication date: not recorded
    Observation id: legacy:frontend:gpt-5.1-codex::high
    Protocol: inspect · file data/raw/designarena.json
Missing coverage · 133 benchmark versions

No result does not mean a zero, or that the model was never tested. Collection failures and disputed versions retain their distinct status.

SUBSCRIPTION PLAN

GitHub Copilot

Legacy annual Pro/Pro+ request billing only.

Multiplier 3.00×
Effective cost $0.120 / request

Legacy annual-plan model; not in the current usage-based supported-model catalog.

Token offers by platform · 2 offers (Adjusted $/task)

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2 offers within the active global filters; “—” means the catalog is active but no public token price is available.

OpenRouter (1)

Azure

Azure AI Foundry (1)

Azure AI Foundry
GPT-5.1 Codex (high) — benchmarks & cost | Benchmark Heaven