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GPT-5.1 Codex
openai·openai/gpt-5.1-codex·GA·Closed·gpt-codex series
Codex GPT for repository edits, code review, and practical software agents
At a glance
Reference price$1.25 / $10.00 per 1M
Cache read $0.125 · Abacus
Lowest paid$1.07 / $8.50
OpenCode Zen Gateway · 1.2× spread
Context400,000
⚠ Providers report 272,000–400,000; the table below is authoritative
Output limit128,000
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImageAudioPDF
Knowledge cutoff2024-09-30
Released / updated2025-11-13 / 2025-11-13
Quality & performanceArtificial Analysis · Intelligence Index v4.1 · rep. tier high
Intelligence35.6
Value12
Coding—
Agentic—
Output speed—
TTFT—
Value formulaIQ 35.6 ÷ min blended $2.928 = 12
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
Available at 17 providers17 with public prices
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| OpenCode Zen | Gateway | $1.07 | $8.50 | $0.107 | — | 400,000 | 128,000 | |
| Poe | Gateway | $1.10 | $9.00 | $0.11 | — | 400,000 | 128,000 | |
| Jiekou.AI | Gateway | $1.13 | $9.00 | — | — | 400,000 | 128,000 | |
| OrcaRouter | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| NanoGPT | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| Impossibl | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| OpenRouter | Gateway | $1.25 | $10.00 | $0.13 | — | 400,000 | 128,000 | |
| Vivgrid | Gateway | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
| ZenMux | Gateway | $1.25 | $10.00 | $0.12 | — | 400,000 | 64,000 | |
| Azure Cognitive Services | First-party | $1.25 | $10.00 | $0.125 | — | 400,000 | 128,000 | |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1OpenCode Zen$523.44
2Poe$551.20
3ZenMux$614.40
4OrcaRouter$615.00
5NanoGPT$615.00
6Impossibl$615.00
The cheapest paid channel is the only channel.
Benchmark
No upstream benchmark data for this model. For quality, see the Artificial Analysis intelligence score above.
Reasoning control
effort = loweffort = mediumeffort = high
4 / 17 providers expose no reasoning control (reasoning_options: []).
Related models
GPT-5.3 Codexsame series$1.75 / $14.00GPT-5.3 Codex (OpenAI)same series$1.75 / $14.00GPT-5.3 Codex (Azure)same series$1.75 / $14.00Kimi K2.6cheaper alternative$0.95 / $4.00DeepSeek V4 Procheaper alternative$0.435 / $0.87DeepSeek V4 Flashcheaper alternative$0.14 / $0.28Kimi K2.7 Codecheaper alternative$0.95 / $4.00
Price historyone sample accumulated per data sync
Input listOutput listMin blended