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OpenAI model product

GPT-5.3-Codex

3-Codex is OpenAI's most capable coding model, combining frontier agentic coding capabilities, improvements in aesthetics, and context compaction.

Updated Aug 17, 2026. Default version: GPT-5.3 Codex

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LLMBoard Score62.9GPT-5.3 Codex
Coverage20%6 benchmark families
Context window400KTokens
Official input price$1.75OpenAI API

On this page

  • Capability
  • Benchmarks
  • Arena
  • Pricing
  • Runtime
  • Specification
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  • FAQ

GPT-5.3-Codex Capability Profile

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

GPT-5.3 Codex LLMBoard score breakdown

GPT-5.3-Codex Benchmark Results

Benchmark scores for GPT-5.3 Codex.

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Benchmark
Score
Rank
Participants
Percentile
Evidence
Evaluated
BenchmarkCybersecurity CTFsScore77.6%Rank01Participants3Percentile100.0%EvidenceCEvaluatedAug 17, 2026
BenchmarkSWE-Lancer (IC-Diamond subset)Score81.4%Rank02Participants6Percentile80.0%EvidenceCEvaluatedAug 17, 2026
BenchmarkTerminal-Bench 2.0Score77.3%Rank04Participants51Percentile94.0%EvidenceCEvaluatedAug 17, 2026
BenchmarkOSWorld-VerifiedScore64.7%Rank19Participants24Percentile21.7%EvidenceCEvaluatedAug 17, 2026
BenchmarkLiveBenchScore72.8%Rank23Participants38Percentile40.5%EvidenceBEvaluatedAug 17, 2026
BenchmarkSWE-Bench ProScore56.8%Rank27Participants50Percentile46.9%EvidenceCEvaluatedAug 17, 2026

GPT-5.3-Codex Arena Results

Preference and agent-evaluation results for the default version.

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Arena
Category
Rank
Rating / score
Votes
Observations
Result date
ArenawebdevCategoryoverallRank59Rating / score1408.6Votes2,525ObservationsN/AResult dateAug 14, 2026
ArenawebdevCategoryoverallRank76Rating / score1369.3Votes3,504ObservationsN/AResult dateAug 14, 2026

GPT-5.3-Codex Pricing

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

Official API
$1.75 input, $14 output per 1M
Official provider
OpenAI
Lowest third-party
From $1.6 input, $13 output per 1M via Poe
Tracked offerings
26
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Provider
Provider model ID
Region
Input / 1M
Output / 1M
Context
Updated
ProviderPoeProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.6Output / 1M$13Context400KUpdatedAug 17, 2026
ProviderOrcaRouterProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderNanoGPTProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderImpossiblProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderOpenRouterProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderOpenAIProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderVivgridProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderCloudflare AI GatewayProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderFastRouterProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderZenMuxProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderFreeModelProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderOfoxProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderNeonProvider model IDgpt-5-3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderAzure Cognitive ServicesProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderOpenCode ZenProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderAzureProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderFrogBotProvider model IDgpt-5-3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderAIHubMixProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderVercel AI GatewayProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderEden AIProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderLLM GatewayProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderGitHub CopilotProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderKilo GatewayProvider model IDopenai/gpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderPioneerProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderAbacusProvider model IDgpt-5.3-codexRegionglobalInput / 1M$1.75Output / 1M$14Context400KUpdatedAug 17, 2026
ProviderVenice AIProvider model IDopenai-gpt-53-codexRegionglobalInput / 1M$2.19Output / 1M$17.5Context400KUpdatedAug 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-5.3-Codex Runtime Performance

Provider-specific output speed and catalog latency for GPT-5.3 Codex. Runtime does not affect the capability score.

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Provider
Output Speed
Catalog Latency
Max Input
Max Output
Updated
ProviderOpenAIOutput Speed2.395 tok/sCatalog Latency7.363 sMax Input400KMax Output128KUpdatedAug 17, 2026

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

GPT-5.3-Codex Specifications

Technical details for the model's default version.

Version
GPT-5.3 Codex
Released
Feb 5, 2026
Knowledge cutoff
Aug 31, 2025
Parameters
N/A
Context window
400K
Max output
128K
Inputs
image, pdf, text
Outputs
text
Open weights
No
License
Proprietary

GPT-5.3-Codex Versions

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

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Version
Released
LLMBoard
Parameters
Context
Max output
Open weights
License
VersionGPT-5.3 CodexReleasedFeb 5, 2026LLMBoard62.9ParametersN/AContext400KMax output128KOpen weightsNoLicenseProprietary

GPT-5.3-Codex vs nearby models

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

GPT-5.3-CodexvsKimi K2.5GPT-5.3-CodexvsInkling SmallGPT-5.3-CodexvsGemini 3 FlashGPT-5.3-CodexvsMiMo V2 ProGPT-5.3-CodexvsNemotron 3 UltraGPT-5.3-CodexvsGPT-5.1

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What is GPT-5.3-Codex?

Key information about GPT-5.3-Codex and its available data.

3-Codex is OpenAI's most capable coding model, combining frontier agentic coding capabilities, improvements in aesthetics, and context compaction. 4%). First model classified as High capability for cybersecurity under OpenAI's Preparedness Framework. Available in the Codex app and API.

Data as of 2026-08-17.

FAQ

Common questions about GPT-5.3-Codex.

When was GPT-5.3-Codex released?

GPT-5.3-Codex's default version was released on Feb 5, 2026.

How much does GPT-5.3-Codex cost?

GPT-5.3-Codex's official API price is $1.75 per million input tokens and $14 per million output tokens via OpenAI. The lowest tracked third-party offer starts at $1.6 input and $13 output via Poe.

Who created GPT-5.3-Codex?

GPT-5.3-Codex was created by OpenAI.

What is the context window for GPT-5.3-Codex?

The default version has a 400K token context window.

Is GPT-5.3-Codex open weight?

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

How many API providers offer GPT-5.3-Codex?

26 provider offerings are linked to the default version.

What models should I compare GPT-5.3-Codex with?

Nearby ranked alternatives include Kimi K2.5, Inkling Small, Gemini 3 Flash.