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GPT-5.3-Codex

OpenAI · openai/gpt-5.3-codex

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GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...

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Context

Max context: 400000
Max output: 128000

Pricing

Input / 1M: 1.75
Output / 1M: 14.00
Blend / 1M: 7.88

Quality

Quality index: —
Arena unavailable: All LMArena fetches failed: text: LMArena text snapshot request failed: 429 Too Many Requests; text@2026-07-23: LMArena text-2026-07-23 snapshot request failed: 429 Too Many Requests; text@2026-07-16: LMArena text-2026-07-16 snapshot request failed: 429 Too Many Requests; text@2026-07-09: LMArena text-2026-07-09 snapshot request failed: 429 Too Many Requests; code: LMArena code snapshot request failed: 429 Too Many Requests; code@2026-07-23: LMArena code-2026-07-23 snapshot request failed: 429 Too Many Requests; code@2026-07-16: LMArena code-2026-07-16 snapshot request failed: 429 Too Many Requests; code@2026-07-09: LMArena code-2026-07-09 snapshot request failed: 429 Too Many Requests; vision: LMArena vision snapshot request failed: 429 Too Many Requests; vision@2026-07-23: LMArena vision-2026-07-23 snapshot request failed: 429 Too Many Requests; vision@2026-07-16: LMArena vision-2026-07-16 snapshot request failed: 429 Too Many Requests; vision@2026-07-09: LMArena vision-2026-07-09 snapshot request failed: 429 Too Many Requests; document: LMArena document snapshot request failed: 429 Too Many Requests; document@2026-07-23: LMArena document-2026-07-23 snapshot request failed: 429 Too Many Requests; document@2026-07-16: LMArena document-2026-07-16 snapshot request failed: 429 Too Many Requests; document@2026-07-09: LMArena document-2026-07-09 snapshot request failed: 429 Too Many Requests; search: LMArena search snapshot request failed: 429 Too Many Requests; search@2026-07-23: LMArena search-2026-07-23 snapshot request failed: 429 Too Many Requests; search@2026-07-16: LMArena search-2026-07-16 snapshot request failed: 429 Too Many Requests; search@2026-07-09: LMArena search-2026-07-09 snapshot request failed: 429 Too Many Requests

Provider

Provider: OpenAI
Moderated: yes