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OpenAI

GPT-5.1

mainstreamClosed

GPT-5.1 is OpenAI's latest frontier-grade model in the GPT-5 series, delivering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style than GPT-5. It uses adaptive reasoning and supports a 400K-token context window. Priced at 1.25 USD per million input tokens and 10.0 USD per million output tokens, it suits demanding general-purpose reasoning, instruction-following, and conversational workloads.

API Pricing

Input

$1.25

Output

$10

Cached input

—

Peak hours

—

USD / 1M tokens

※ Verified via OpenRouter live pricing (2026-11-02): $1.25 input / $10.0 output per million tokens.

Specifications

Context window
400K Tokens
Max output
—
Input modalities
Text
License
Closed

Capabilities & use cases

Key capabilities

  • Frontier-grade GPT-5 series model
  • Adaptive reasoning
  • Improved instruction adherence
  • Natural conversational style
  • 400K-token context window
  • General-purpose reasoning

Best for

  • General-purpose reasoning tasks
  • Instruction-following workloads
  • Conversational applications
  • Long-context processing

Official links

Website ↗API platform ↗Pricing page ↗Open in comparator ↗

Same vendor

GPT-6.1 SolGPT-6 AstraGPT-5.6 LunaGPT-5.6 SolGPT-6 LunaGPT-5.6 Terra

Similar price

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FAQ

What does GPT-5.1 cost?
GPT-5.1 is priced at $10 output and $1.25 input (USD per 1M tokens)
How large is the context window of GPT-5.1?
GPT-5.1 has a 400K Tokens context window with up to — output.
Where can I access GPT-5.1?
Official channels: Website and API platform.

Data is refreshed daily and cross-checked against two independent sources; please confirm pricing and specs on the vendor page.