OpenAI
GPT-5.1 Codex
Released Nov 13, 2025 · 187B tokens this week · 2 providers
Overview
A GPT-5.1 variant specialised for software engineering: repository-scale edits, test-driven iteration and long agent loops in a terminal. It is trained to keep working through multi-file refactors instead of answering in one shot. Less chatty than the general model and noticeably better at patch formats.
Providers
Reference data — not yet measured from live traffic
| PROVIDER | MAX OUT | OUTPUT /M | QUANT | |||||
|---|---|---|---|---|---|---|---|---|
OpenAICheapest | 400K | 128K | $1.25 | $10.00 | 208ms | 88 | 99.89% | Full |
Azure AI Foundry | 400K | 128K | $1.31 | $10.50 | 860ms | 70 | 99.64% | Full |
Latency p50 reflects a provider’s API endpoint responsiveness — the round-trip to its API, not per-token inference time. These figures, with throughput and uptime, are reference data until the gateway aggregates its own traffic.
Price comparison
Blended $ per 1M tokens
Blended rate per 1M tokens, weighted one part prompt to three parts completion — roughly the shape of a chat workload. Your mix will move the number.
Call it
OpenAI-compatible — swap the base URL and go
curl https://model.cards/api/v1/chat/completions \
-H "Authorization: Bearer $MODELCARDS_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5.1-codex",
"messages": [
{ "role": "user", "content": "Summarize the tradeoffs of speculative decoding." }
]
}'