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.

#	Provider	Price channel	Raw input $/1M	Raw output $/1M	Adjusted $/task
1	Azurevia OpenRouter — Price via OpenRouter: OpenRouter's price for Azure's endpoint (https://openrouter.ai/openai/gpt-5.1-codex/providers), collected 2026-11-03.	via OpenRouter — Price via OpenRouter: OpenRouter's price for Azure's endpoint (https://openrouter.ai/openai/gpt-5.1-codex/providers), collected 2026-11-03.	$1.25	$10.00
2	Azure AI Foundrydirect — Direct price: Azure AI Foundry's own price list (https://prices.azure.com/api/retail/prices), collected 2026-11-03.	direct — Direct price: Azure AI Foundry's own price list (https://prices.azure.com/api/retail/prices), collected 2026-11-03.	$1.25	$10.00

Composite

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

26.1

Thin data · 2/7

AA Coding v4.x —Coding Agent v1.4 —AA Intelligence (est.) 12.1AA Agentic —Epoch ECI —Software ECI —DesignArena 1005/—

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

Benchmark sheet

10 of 319 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

Terminal-Bench Hard (AA)8034.8%2026-09-10
Terminal-Bench Hard (AA) pinned revision 74221fb → · Published board — Tests a pinned 44-task hard subset of terminal-based work using Terminus 2.

Coding

DesignArena Web Apps (agentic)01,005 Elo2026-11-03
DesignArena Web Apps (agentic) published 2026-11-03 → · Published board — Published Elo. Exact source attachment is retained; fewer than 200 battles excludes a row from radar normalization and anomaly peers.

Instruction-following

IFBench (AA single-turn)8470.0%2026-09-10
IFBench (AA single-turn) published 2026-09-10 → · Published board — Tests precise single-turn instructions with deterministic rule checks.

Knowledge

Humanity's Last Exam (AA text-only)7625.7%2026-09-10
Humanity's Last Exam (AA text-only) published 2026-09-10 → · Published board — Tests expert-level knowledge on AA's text-only Humanity's Last Exam subset.
AA-Omniscience Index74-6.502026-09-10
AA-Omniscience Index published 2026-09-10 → · Published board — Tests factual reliability while rewarding correct answers and penalizing hallucinations.

Long-context

AA-LCR v1.16469.3%2026-09-10
AA-LCR v1.1 v1.1 → · Published board — Tests reasoning across multiple long documents with corrected answer keys and grading.

Math

AIME 2025 (AA)9895.7%2026-09-10
AIME 2025 (AA) v2025 → · Published board — Advanced mathematical problem solving on AIME I and II 2025.

Science

CritPt (AA)795.7%2026-09-10
CritPt (AA) published 2026-09-10 → · Published board — Tests research-level physics reasoning with Python, symbolic and numerical answers.
GPQA Diamond (AA)8186.0%2026-09-10
GPQA Diamond (AA) published 2026-09-10 → · Published board — Tests graduate-level biology, physics and chemistry knowledge on the Diamond subset.

Tool-use

τ²-Bench Telecom (AA)7383.0%2026-09-10
τ²-Bench Telecom (AA) published 2026-09-10 → · Published board — Tests dual-control telecom agents that coordinate tool use with a simulated user.

Vision

MMMU Pro (AA)5672.5%2026-09-10
MMMU Pro (AA) published 2026-09-10 → · Published board — Tests multimodal understanding using challenging ten-option questions.

Unusual results

1 threshold-crossing signal flagged · 11 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 2026-11-03
Why
Observed: 1005 Elo
Peer mean 1186.64151 · peer sd 84.38324 · n 53 · families 51
Directed z -2.153 · baseline z 0.838 · gap -2.991 · profile n 10
1005 Elomeasured525 battlesobserved 2026-11-03designarena.ai ↗
Evidence
Axis: DesignArena Web Apps (agentic) · published 2026-11-03 · Published board
Exact value: 1005 Elo
Observed: 2026-11-03 · publication date: not recorded
Observation id: legacy:frontend:gpt-5.1-codex::high
Source: https://www.designarena.ai/leaderboard/webapps
Protocol: inspect · file data/raw/designarena.json

Missing coverage · 309 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.

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

Click any underlined price to see how it is estimated and where each input comes from. How we calculate adjusted cost.

2 offers within the active global filters; “price n/a” means the provider serves the model but publishes no direct token price we could collect — no other channel's price is shown in its place.

OpenRouter (1)

Prices via OpenRouter — what OpenRouter charges for each provider's endpoint, not the provider's own direct price. Source: openrouter.ai/openai/gpt-5.1-codex/providers, collected 2026-11-03.

Azure

Azure AI Foundry (1)

Direct prices from Azure AI Foundry's own price list. Source: prices.azure.com/api/retail/prices, collected 2026-11-03.

Azure AI Foundry