llmboard.aiAI model intelligence
Home

Model Rankings

OverallOpen ModelsAgentCodingReasoningMathKnowledgeInstruction FollowingTextVision
Image GenerationImage Editing
Video GenerationImage to VideoVideo Editing
Text to SpeechSpeech to Text
Embeddings

Efficiency

Chat Token PricingImage PricingVideo PricingAudio Pricing
Chat Speed & LatencyProvider Reliability

Benchmarks

GPQAMMLU-ProAIME 2025SWE-Bench VerifiedMMLUHumanity's Last ExamLiveCodeBenchMATHHumanEvalMMMU-Pro
All Benchmarks

Tools

Model DirectoryCompare Models

Scoring & Data

Scoring & Data
393 models668 benchmarks

Leaderboard Center

Overall RankingCodingCore BenchmarksPrice & ValueRuntime Performance

Modalities

All ModelsImage GenerationImage EditingVideo GenerationImage-to-VideoVideo EditingText-to-SpeechSpeech-to-TextEmbeddings

Data & Methods

Scoring MethodAll BenchmarksReasoningMath

Vendors

All VendorsOpenAIAnthropicGoogle
llmboard.aiCopyright 2026 llmboard.ai

OpenAI model product

GPT-5.1-Codex

1 optimized for agentic coding tasks in Codex or similar environments.

Updated Aug 17, 2026. Default version: GPT-5.1 Codex

Compare
LLMBoard Score49.6GPT-5.1 Codex
Coverage20%3 benchmark families
Context window400KTokens
Official input priceN/AOfficial price unavailable

On this page

  • Capability
  • Benchmarks
  • Arena
  • Pricing
  • Runtime
  • Specification
  • Versions
  • Compare
  • Similar models
  • About
  • FAQ

GPT-5.1-Codex Capability Profile

This profile uses the model's current scored version. Arena ratings and prices are shown separately.

GPT-5.1 Codex LLMBoard score breakdown

GPT-5.1-Codex Benchmark Results

Benchmark scores for GPT-5.1 Codex.

3 rows
Columns

Show columns

Sort by
Benchmark
Score
Rank
Participants
Percentile
Evidence
Evaluated
BenchmarkSWE-LancerScore66.3%Rank01Participants4Percentile100.0%EvidenceCEvaluatedAug 17, 2026
BenchmarkTerminal-Bench 2.0Score52.8%Rank32Participants51Percentile38.0%EvidenceCEvaluatedAug 17, 2026
BenchmarkSWE-Bench VerifiedScore73.7%Rank43Participants111Percentile61.8%EvidenceCEvaluatedAug 17, 2026

GPT-5.1-Codex Arena Results

Preference and agent-evaluation results for the default version.

1 rows
Columns

Show columns

Sort by
Arena
Category
Rank
Rating / score
Votes
Observations
Result date
ArenawebdevCategoryoverallRank89Rating / score1336.4Votes4,870ObservationsN/AResult dateAug 14, 2026

GPT-5.1-Codex Pricing

Official vendor API pricing appears first, followed by individual provider offers.

Official API
N/A
Official provider
N/A
Lowest third-party
From $1.07 input, $8.5 output per 1M via OpenCode Zen
Tracked offerings
18
18 rows
Columns

Show columns

Sort by
Provider
Provider model ID
Region
Input / 1M
Output / 1M
Context
Updated
ProviderOpenCode ZenProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.07Output / 1M$8.5Context400KUpdatedAug 17, 2026
ProviderPoeProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.1Output / 1M$9Context400KUpdatedAug 17, 2026
ProviderJiekou.AIProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.13Output / 1M$9Context400KUpdatedAug 17, 2026
ProviderOrcaRouterProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderNanoGPTProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderImpossiblProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderOpenRouterProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderVivgridProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderZenMuxProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderHeliconeProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderAzure Cognitive ServicesProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderAzureProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderAIHubMixProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderVercel AI GatewayProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderEden AIProvider model IDazure/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context272KUpdatedAug 17, 2026
ProviderLLM GatewayProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderKilo GatewayProvider model IDopenai/gpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026
ProviderAbacusProvider model IDgpt-5.1-codexRegionglobalInput / 1M$1.25Output / 1M$10Context400KUpdatedAug 17, 2026

Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.

GPT-5.1-Codex Runtime Performance

Provider-specific output speed and catalog latency for GPT-5.1 Codex. Runtime does not affect the capability score.

1 rows
Columns

Show columns

Sort by
Provider
Output Speed
Catalog Latency
Max Input
Max Output
Updated
ProviderOpenAIOutput Speed50 tok/sCatalog Latency3 sMax Input400KMax Output128KUpdatedAug 17, 2026

Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.

GPT-5.1-Codex Specifications

Technical details for the model's default version.

Version
GPT-5.1 Codex
Released
Nov 19, 2025
Knowledge cutoff
Sep 30, 2024
Parameters
N/A
Context window
400K
Max output
128K
Inputs
image, text
Outputs
text
Open weights
No
License
Proprietary

GPT-5.1-Codex Versions

Available versions of this model. The score column identifies the version used in the overall ranking.

2 rows
Columns

Show columns

Sort by
Version
Released
LLMBoard
Parameters
Context
Max output
Open weights
License
VersionGPT-5.1 CodexReleasedNov 19, 2025LLMBoard49.6ParametersN/AContext400KMax output128KOpen weightsNoLicenseProprietary
VersionGPT-5.1 Codex HighReleasedNov 12, 2025LLMBoardN/AParametersN/AContext400KMax output128KOpen weightsNoLicenseProprietary

GPT-5.1-Codex vs nearby models

Open a comparison with the three ranked models immediately above and below this model.

GPT-5.1-CodexvsGrok 4.1 ThinkingGPT-5.1-CodexvsMAI Code 1 FlashGPT-5.1-CodexvsGemini 2.5 ProGPT-5.1-CodexvsGPT-5GPT-5.1-CodexvsGLM 4.5GPT-5.1-CodexvsGPT-5.4-nano

Models similar to GPT-5.1-Codex

Recommendations prioritize the same model type and family, then the closest LLMBoard score.

#102-0.0
OP

GPT-5

OpenAI

49.5 LLMBoard

DetailsCompare
#104-0.6
OP

GPT-5.4-nano

OpenAI

48.9 LLMBoard

DetailsCompare
#90+2.8
OP

o3

OpenAI

52.4 LLMBoard

DetailsCompare
#111-3.7
OP

GPT-OSS-20B

OpenAI

45.9 LLMBoard

DetailsCompare
#86+4.0
OP

GPT-5.5-Instant

OpenAI

53.5 LLMBoard

DetailsCompare
#115-4.9
OP

GPT-5-mini

OpenAI

44.7 LLMBoard

DetailsCompare

What is GPT-5.1-Codex?

Key information about GPT-5.1-Codex and its available data.

1 optimized for agentic coding tasks in Codex or similar environments. It features higher reasoning capabilities and is available in the Responses API. The underlying model snapshot is regularly updated.

Data as of 2026-08-17.

FAQ

Common questions about GPT-5.1-Codex.

When was GPT-5.1-Codex released?

GPT-5.1-Codex's default version was released on Nov 19, 2025.

How much does GPT-5.1-Codex cost?

No official standard PAYG price is currently available for GPT-5.1-Codex. The lowest tracked third-party offer starts at $1.07 input and $8.5 output via OpenCode Zen.

Who created GPT-5.1-Codex?

GPT-5.1-Codex was created by OpenAI.

What is the context window for GPT-5.1-Codex?

The default version has a 400K token context window.

Is GPT-5.1-Codex open weight?

No. The default version is not marked as having publicly available weights.

How many API providers offer GPT-5.1-Codex?

18 provider offerings are linked to the default version.

What models should I compare GPT-5.1-Codex with?

Nearby ranked alternatives include Grok 4.1 Thinking, MAI Code 1 Flash, Gemini 2.5 Pro.