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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$0.060.73s83 tps100%
OpenAI$1.25$10$0.131.30s54 tps100%
Azure$1.25$10$0.132.89s48 tps99.81%
Azureswedencentral$1.38$11$0.141.16s94 tps—
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 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
Azure OpenAI OpenAI
0 tok/s100 tok/s200 tok/s300 tok/s400 tok/s
Oct 11, 12 AMOct 11, 8 AMOct 11, 4 PMOct 12, 12 AMOct 12, 8 AMOct 12, 4 PMOct 13, 12 AMOct 13, 8 AMOct 13, 4 PMOct 14, 12 AMOct 14, 8 AM
Azure OpenAI OpenAI

Uptime

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

Last 3 daysAvailability 99.9%
Oct 11, 2:00 PMNow
Availability over the last 24 hoursAvailability 99.86%
100% 98% 97% 95%
Oct 13, 2:40 PMNow

Apps

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

Spicy Writer33.3% of tokens1.8BDify.AIPersonal Agent · 26.1% of tokens1.4BCandace Admin15.7% of tokens845.8MAchieveApex12.9% of tokens696.1MDr. Dogalicious AI Vet Nutritionist12.1% of tokens651.3M

Activity

118.2B tokens processed market-wide in the last month.

02.0B4.0B6.0B8.0B
Sep 14Sep 19Sep 24Sep 29Oct 4Oct 9Oct 14
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 http://192.168.1.55/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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