Alex Getmanearly AI signals
EN

GPT-5.1

OpenAI

Released Updated
Context window
400K
400,000 tokens
Max output
128K
128,000 tokens
Input / Output
text, image → text

API pricing

USD / 1M tokens

InputOutputCached input
  • $1.25
openai-pricing
  • $10.00
openai-pricing
  • $0.125
openai-pricing
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Timeline

  1. · API availability · evidence link · evidence link
Input / output price · USD / 1M tokens
ModelEvidence linksInput / output price
gpt-5.1
batch
openai
API route unavailable
$0.625 / $5.00
gpt-5.1
fast
openai
API route unavailable
$2.50 / $20.00
gpt-5.1
flex
openai
API route unavailable
$0.625 / $5.00
gpt-5.1
standard
openai$1.25 / $10.00
  1. · Evidence links · OpenAI · official articles
    Excerpt
    In ChatGPT, GPT‑5.1 will still be available to paid users for three months under legacy models, after which we will sunset GPT‑5.1
  2. · Confirmed use · OpenAI · official articles · Introducing group chats in ChatGPT
  3. · Evidence links · OpenAI · official articles
  4. · Catalogue listing · GitHub · openai/openai-node · code
    Excerpt
    | 'gpt-5.4-nano' | 'gpt-5.4-mini-2026-03-17' | 'gpt-5.4-nano-2026-03-17' | 'gpt-5.3-chat-latest' | 'gpt-5.2' | 'gpt-5.2-2025-12-11' | 'gpt-5.2-chat-latest' | 'gpt-5.2-pro' | 'gpt-5.2-pro-2025-12-11' | 'gpt-5.1' | 'gpt-5.1-2025-11-13' | 'gpt-5.1-codex' | 'gpt-5.1-mini' | 'gpt-5.1-chat-latest' | 'gpt-5' | 'gpt-5-mini' | 'gpt-5-nano' | 'gpt-5-2025-08-07' | 'gpt-5-mini-2025-08-07' | 'gpt-5-nano-2025-08-07' | 'gpt-5-chat-latest' | 'gpt-4.1' | 'gpt-4.1-mini' | 'gpt-4.1-nano' | 'gpt-4.1-2025-04-14' | 'gpt-4.1-mini-2025-04-14' | 'gpt-4.1-nano-2025-04-14' | 'o4-mini' | 'o4-mini-2025-04-16' | 'o3' | 'o3-2025-04-16' | 'o3-mini' | 'o3-mini-2025-01-31' | 'o1' | 'o1-2024-12-17' | 'o1-preview' | 'o1-preview-2024-09-12' | 'o1-mini' | 'o1-m
  5. · Catalogue listing · GitHub · openai/codex · code
    Excerpt
    model = "gpt-5.1" # Consider setting [mcp_servers] here!
  6. · Catalogue listing · GitHub · openai/openai-agents-python · code
    Excerpt
    -2025-08-07", "gpt-5-codex", "gpt-5-mini", "gpt-5-mini-2025-08-07", "gpt-5-nano", "gpt-5-nano-2025-08-07", "gpt-5-pro", "gpt-5-pro-2025-10-06", "gpt-5.1", "gpt-5.1-2025-11-13", "gpt-5.1-codex", "gpt-5.1-codex-max", "gpt-5.1-codex-mini", "gpt-5.2", "gpt-5.2-2025-12-11", "gpt-5.2-codex", "gpt-5.2-pro", "gpt-5.2-pro-2025-12-11", "gpt-5.3-codex", "gpt-5.4-mini", "gpt-5.4-mini-2026-03-17", "gpt-5.4-nano", "gpt-5.4-nano-2026-03-17", ), 400_000, ), **_model_context_windows( ( "codex-mini-latest", "o1", "o1-2024-12-17", "o1-pro", "o1-
  7. · Catalogue listing · GitHub · openai/openai-python · code
    Excerpt
    "gpt-5.4-nano-2026-03-17", "gpt-5.3-chat-latest", "gpt-5.2", "gpt-5.2-2025-12-11", "gpt-5.2-chat-latest", "gpt-5.2-pro", "gpt-5.2-pro-2025-12-11", "gpt-5.1", "gpt-5.1-2025-11-13", "gpt-5.1-codex", "gpt-5.1-mini", "gpt-5.1-chat-latest", "gpt-5", "gpt-5-mini", "gpt-5-nano", "gpt-5-2025-08-07", "gpt-5-mini-2025-08-07", "gpt-5-nano-2025-08-07", "gpt-5-chat-latest", "gpt-4.1", "gpt-4.1-mini", "gpt-4.1-nano", "gpt-4.1-2025-04-14", "gpt-4.1-mini-2025-04-14", "gpt-4.1-nano-2025-04-14", "o4-mini", "o4-mini-2025-04-16", "o3", "o3-2025-04-16",
  8. · Catalogue listing · GitHub · openai/openai-agents-js · code
    Excerpt
    4.1-2025-04-14', 'gpt-4.1-mini', 'gpt-4.1-mini-2025-04-14', 'gpt-4.1-nano', 'gpt-4.1-nano-2025-04-14', ]); const SANDBOX_CONTEXT_WINDOWS_400K = new Set([ 'gpt-5', 'gpt-5-codex', 'gpt-5-mini', 'gpt-5-nano', 'gpt-5-pro', 'gpt-5.1', 'gpt-5.1-codex', 'gpt-5.1-codex-max', 'gpt-5.1-codex-mini', 'gpt-5.2', 'gpt-5.2-codex', 'gpt-5.2-codex-cyber', 'gpt-5.2-pro', 'gpt-5.3-codex', 'gpt-5.3-codex-spark', 'gpt-5.4-mini', 'gpt-5.4-nano', ]); const SANDBOX_CONTEXT_WINDOWS_200K = new Set([ 'codex-mini-latest', 'o1', 'o1-2024-12-17', 'o1-pro', 'o3', 'o3-2025-04-16', 'o3-mini', 'o3-pro', 'o3-deep-research', 'o4-mini', 'o4-mini-2025-04-16', 'o4-mini-deep-research', ]); const SANDBOX_CONTEXT_WINDOWS_128K = new Set([ 'gpt-4o', 'gpt-4o-2024-08-06', 'gpt-4o-mini', 'gpt-4o-mini-2024-07-18', 'gpt-5-chat-latest', 'gpt-5.1
  9. · Evidence links · OpenAI · Model release notes
    Excerpt
    As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT
  10. · Evidence links · OpenAI · system cards
  11. · Evidence links · OpenAI · news
    Excerpt
    GPT-5.1 is now available in the API, bringing faster adaptive reasoning, extended prompt caching, improved coding performance, and new apply_patch and shell tools
  12. · Evidence links · OpenAI · ChatGPT release notes
    Excerpt
    As of March 11, 2026, GPT-5.1 models are no longer available in ChatGPT
  13. · Evidence links · OpenAI · ChatGPT release notes

Signals 1

Specifications

GPT-5.1 is a model from OpenAI, released on 13 Nov 2025. The context window is 400,000 tokens. The maximum output is 128,000 tokens. Pricing is $1.25 per million input tokens and $10.00 per million output tokens.

Context window
400,000
Max output
128,000
Input
text · image
Output
text
Input · USD / 1M tokens
$1.25
Output · USD / 1M tokens
$10.00
Cached input · USD / 1M tokens
$0.125

Questions

What is the context window of GPT-5.1?

The context window is 400,000 tokens. The maximum output is 128,000 tokens.

How much does GPT-5.1 cost?

Pricing is $1.25 per million input tokens and $10.00 per million output tokens. Cached input is $0.125 per million.

When was GPT-5.1 released?

On 13 Nov 2025.