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OpenAI: GPT-5.1

openai/gpt-5-1
CompareAPITry this model

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5.

Modalities
In / out per 1M$1.25 / $10
Context391K
ReleasedNov 13, 2025

Providers

5 providers serve this model upstream.

Providers serving this model
ProviderInput /MOutput /MCache read /MLatency P50Throughput P50Uptime
OpenAI$0.63$5.00$0.061.05s90 tps100%
Azure$1.25$10$0.132.05s52 tps100%
OpenAI$1.25$10$0.131.48s48 tps100%
Azureswedencentral$1.38$11$0.142.32s112 tps100%
OpenAI$2.50$20$0.25———

Market-wide measurements, refreshed every 15 minutes. They describe who serves GPT-5.1 in general, not how ProjectCOZY routes your requests.

Pricing

List rates per 1M tokens — what GPT-5.1 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 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.

0.0s2.0s4.0s6.0s8.0s
Oct 16, 12 AMOct 16, 8 AMOct 16, 4 PMOct 17, 12 AMOct 17, 8 AMOct 17, 4 PMOct 18, 12 AMOct 18, 8 AMOct 18, 4 PMOct 19, 12 AMOct 19, 8 AM
OpenAI OpenAI Azure
0 tok/s100 tok/s200 tok/s300 tok/s400 tok/s
Oct 16, 12 AMOct 16, 8 AMOct 16, 4 PMOct 17, 12 AMOct 17, 8 AMOct 17, 4 PMOct 18, 12 AMOct 18, 8 AMOct 18, 4 PMOct 19, 12 AMOct 19, 8 AM
OpenAI OpenAI Azure

Uptime

100% of requests were served successfully over the last 3 days, across all providers.

Last 3 daysAvailability 99.97%
Oct 16, 2:00 PMNow
Availability over the last 24 hoursAvailability 99.97%
100% 98% 97% 95%
Oct 18, 2:30 PMNow

Apps

Tools that most often run GPT-5.1, by tokens this week.

Spicy Writer36.3% of tokens2.2BDify.AIPersonal Agent · 22.6% of tokens1.4BCandace Admin16.5% of tokens1.0BHermes AgentPersonal Agent · 13% of tokens803.6MAchieveApex11.6% of tokens713.0M

Activity

121.3B tokens processed market-wide in the last month.

02.0B4.0B6.0B8.0B
Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14Oct 19
Tokens

FAQ

Which model id do I use for GPT-5.1?
openai/gpt-5.1. Send it as the model field from any OpenAI-compatible client, against https://projectcozy.tech/v1.
How much context does GPT-5.1 hold?
400,000 tokens per request, of which up to 128,000 can be the response.
What can it accept and return?
Input: image, text, file. Output: text.
What does GPT-5.1 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?
OpenAI, in the GPT family.

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