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GPT-5.1 Chat — and what?

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 1 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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GPT-5.1 Chat
openai/gpt-5.1-chat
Provider
OpenAI
Family
GPT-5
Modality
text
Context window
128,000 tok
Max output
16,384 tok
Released
2026-05-22
License
Proprietary
Input price
$1.25 /1M
Output price
$10.00 /1M
Tools
yes
Streaming
yes
Vision
yes
JSON mode
yes
Reasoning
yes
Prompt caching
Batch API
Try it
Open in playground →
GPT-5.1 Chat
openai/gpt-5.1-chat
Full spec →

GPT-5.1 Chat is the chat-tuned variant of GPT-5.1, optimised for back-and-forth conversation and instruction following.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

Compare with another

GPT-5 vs GPT-5.1 Chat
openai/gpt-5 · openai/gpt-5.1-chat
GPT-5 Chat vs GPT-5.1 Chat
openai/gpt-5-chat · openai/gpt-5.1-chat
GPT-5 Mini vs GPT-5.1 Chat
openai/gpt-5-mini · openai/gpt-5.1-chat
GPT-5 Nano vs GPT-5.1 Chat
openai/gpt-5-nano · openai/gpt-5.1-chat
GPT-5.1 vs GPT-5.1 Chat
openai/gpt-5.1 · openai/gpt-5.1-chat