GPT-5.3 Codex
openai/gpt-5.3-codex
Coding-optimized GPT model for repository edits, reviews, and agentic software work
Capabilities
ReasoningYes
Tool callingYes
Structured outputYes
TemperatureFixed
AttachmentYes
Open weightsNo
Limits
Context400,000 tokens
Max input272,000 tokens
Max output128,000 tokens
Details
Familygpt-codex
Knowledge cutoff2025-08-31
Release date2026-02-05
Last updated2026-02-05
Modalities
Inputtext, image, pdf
Outputtext
Benchmarks
SWE-Atlas Codebase QnA
32.6
score
SWE-Atlas Refactoring
42.38
score
SWE-Atlas Test Writing
38.98
score
Community Rating
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Pricing
Cost per 1M tokens
InputN/A
OutputN/A