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GPT-5.3 Codex

Tools
openai/gpt-5.3-codex

Vision · 400K context · Feb 2026 · 21 upstreams

GPT-5.3 Codex is OpenAI's Codex-environment variant of GPT-5.3 for agentic coding. It accepts text and image input and supports reasoning, streaming, function calling and structured outputs.

Needs your own keyTo use GPT-5.3 Codex, add your OpenAI key, or a key from another provider that serves it. AnyRouter adds no fee.
context
400K
input / 1M (list)
$1.75
output / 1M (list)
$14.00
routes
21
speed, 24h
No data yet

Upstreams

21
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  7. 7InfronYour keynot addedBilled to your key
  8. 8LLM GatewayYour keynot addedBilled to your key
  9. 9RequestyYour keynot addedBilled to your key
  10. 10AI/ML APIYour keynot addedBilled to your key
  11. 11ZenMuxYour keynot addedBilled to your key
  12. 12AIHubMixYour keynot addedBilled to your key
  13. 13OcarRouterYour keynot addedBilled to your key
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  15. 15NanoGPTYour keynot addedBilled to your key
  16. 16Eden AIYour keynot addedBilled to your key
  17. 17OfoxYour keynot addedBilled to your key
  18. 18Abacus RouteLLMYour keynot addedBilled to your key
  19. 19FluenceYour keynot addedBilled to your key
  20. 20PoeYour keynot addedBilled to your key
  21. 21Jiekou.AIYour keynot addedBilled to your key

Benchmarks

SWE-bench Verified
74.8%
GPQA Diamond
91.5%
HLE
39.9%

Benchmark data from Epoch AI (CC-BY 4.0).

Quick start

curl
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "openai/gpt-5.3-codex",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'

Details

Owner
OpenAI
Kind
Vision
Released
Feb 2026
Context
400K
Data policy
Provider retention
Endpoint
/api/v1/chat/completions