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GPT-5.3 Codex

openai/gpt-5.3-codex

OpenAI / GPT

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Coding-optimized GPT model for repository edits, reviews, and agentic software work

Released
2026-02-05
Context window
400K
Max output
128K
Weights
Closed
Modalities
TextInputImageInputDocumentInputTextOutput
Capabilities
AttachmentsReasoningTool callStructured
Providers
AbacusAIHubMixAzureAzure Cognitive ServicesCloudflare AI GatewayFastRouterFreeModelFrogBotGitHub CopilotKilo GatewayLLM GatewayNanoGPTNeonOpenAIOpenCode ZenOpenRouterOrcaRouterPioneerPoeRequestyVercel AI GatewayVivgridZenMux

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