GPT-5.1: release date and what it's for
Released , according to OpenAI's announcement. Cheaper than everything newer except the small models, and it's still the model OpenAI's own docs describe as best for coding. Read that as stale copy, not a recommendation.
- Status
- Live
- Released
- Lab
- OpenAI
- Input
- $1.25per million tokens
- Output
- $10per million tokens
- Context window
- 400Ktokens
- Max output
- 128Ktokens
API model ID: gpt-5.1
What we've written about GPT-5.1
September 23, 2026
OpenAI model release dates: o3, GPT-5.5 and GPT-6 Astra, Sol and Luna in order
o3 is from April 2025, and the name Sol now means something different from what it meant in July.
How GPT-5.1 compares on price and context
inputoutput
- GPT-6 Astra$10 / $50
- Claude Fable 5.1$10 / $50
- GPT-5.1$1.25 / $10
- GPT-6 Sol$2 / $10
- Muse Spark 1.3$1.25 / $4.25
- Gemini 3.8 Flash$0.75 / $3.75
- GPT-6 Luna$0.10 / $0.50
how much it reads at once
- GPT-6 Sol1.05M
- GPT-6 Luna1.05M
- GPT-6 Astra1.05M
- Muse Spark 1.31.05M
- Gemini 3.8 Flash1.05M
- Claude Fable 5.11M
- GPT-5.1400K
Next to the newest OpenAI models and the current model from other labs. Prices are in US dollars per million tokens.
What is GPT-5.1?
GPT-5.1 is a model from OpenAI, built in the US. It's out, and you can use it today.
When did GPT-5.1 come out?
OpenAI released it on November 13, 2025. That date comes from OpenAI's announcement.
More from OpenAI
OpenAILive
GPT-6 Sol
- in /1M
- $2
- out /1M
- $10
- context
- 1.05M
OpenAILive
GPT-6 Luna
- in /1M
- $0.10
- out /1M
- $0.50
- context
- 1.05M
OpenAILive
GPT-6 Astra
- in /1M
- $10
- out /1M
- $50
- context
- 1.05M
OpenAILive
GPT-5.6 Sol
- in /1M
- $4
- out /1M
- $20
- context
- 1.05M
OpenAILive
GPT-5.6 Luna
- in /1M
- $0.20
- out /1M
- $1.20
- context
- 1.05M
OpenAILive
GPT-5.5 Pro
- in /1M
- $30
- out /1M
- $180
- context
- 1.05M
OpenAILive
GPT-5.5
- in /1M
- $5
- out /1M
- $30
- context
- 1.05M
OpenAILive
GPT-5.4 nano
- in /1M
- $0.20
- out /1M
- $1.25
- context
- 400K
More news: OpenAI news and ChatGPT updates
.