OpenAI: GPT-5.1-Codex
openai/gpt-5-1-codexGPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows.
Modalities
In / out per 1M$1.25 / $10
Context391K
ReleasedNov 13, 2025
Providers
1 provider serves this model upstream.
| Provider | Input /M | Output /M | Cache read /M | Latency P50 | Throughput P50 | Uptime |
|---|---|---|---|---|---|---|
 Azure | $1.25 | $10 | $0.13 | 9.09s | 61 tps | 99.84% |
Market-wide measurements, refreshed every 15 minutes. They describe who serves GPT-5.1-Codex in general, not how ProjectCOZY routes your requests.
Pricing
List rates per 1M tokens — what GPT-5.1-Codex costs pay-as-you-go elsewhere, not what you pay here.
Input
$1.25
per 1M tokens
Output
$10
per 1M tokens
Cache read
$0.13
per 1M cached tokens
Included in every pass
GPT-5.1-Codex is included in every ProjectCOZY pass at no extra cost — one flat rate, no per-token metering. The rates above are there for comparison.
Performance
Time to first token and output speed across every provider, over the last 3 days.
0.0s100.0s200.0s300.0s400.0s
Oct 11, 1 AMOct 11, 3 PMOct 12, 10 AMOct 12, 6 PMOct 13, 3 AMOct 13, 11 AMOct 13, 8 PMOct 14, 9 AM
Median 90th percentile 99th percentile
0 tok/s50 tok/s100 tok/s150 tok/s200 tok/s
Oct 11, 1 AMOct 11, 3 PMOct 12, 10 AMOct 12, 6 PMOct 13, 3 AMOct 13, 11 AMOct 13, 8 PMOct 14, 9 AM
Median 90th percentile 99th percentile
Uptime
100% of requests were served successfully over the last 3 days, across all providers.
Last 3 daysAvailability 98.87%
Oct 11, 2:00 PMNow
Availability over the last 24 hoursAvailability 98.25%
100% 92% 83% 75%
Oct 13, 2:50 PMNow
Apps
Tools that most often run GPT-5.1-Codex, by tokens this week.
Activity
5.0B tokens processed market-wide in the last month.
0200.0M400.0M600.0M800.0M
Sep 14Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14
Tokens
FAQ
Which model id do I use for GPT-5.1-Codex?
openai/gpt-5.1-codex. Send it as the model field from any OpenAI-compatible client, against http://192.168.1.55/v1.
How much context does GPT-5.1-Codex hold?
400,000 tokens per request, of which up to 128,000 can be the response.
What can it accept and return?
Input: text, image. Output: text.
What does GPT-5.1-Codex cost on a pass?
Nothing beyond the pass itself. Pay-as-you-go elsewhere it lists at $1.25 per 1M input tokens and $10 per 1M output tokens.
Who built GPT-5.1-Codex?
OpenAI, in the GPT family.
Explore
Other models your pass can call.
