lmprices

OpenAIGPT-5.1 API pricing

GPT-5.1 costs $1.25 per 1M input tokens and $10.00 per 1M output tokens on OpenAI's API, since .

Current price

Rates in effect from a prices added first seen by . Every price links to its source.

Input
$1.25
Output
$10.00
Blended 3:1
$3.4375
GPT-5.1 current rates per 1M tokens
RatePer 1M tokens
Standard
Input$1.25
Cached input$0.125
Output$10.00
Batch
Input$0.625
Cached input$0.0625
Output$5.00

Launch price

GPT-5.1 launched at this price on .

Input
$1.25
Output
$10.00
Blended 3:1
$3.4375

Price history

InputOutput
$0$2.50$5$7.50$10Jan 2026Mar 2026May 2026Jul 2026Sep 2026 Input $1.25, from November 13, 2025Output $10.00, from November 13, 2025Output $10.00Input $1.25 $0$2.50$5$7.50$10Jan 2026Jul 2026 Input $1.25, from November 13, 2025Output $10.00, from November 13, 2025Output $10.00Input $1.25
Headline standard prices per 1M tokens. A filled circle marks a dated change; an open circle, a change first seen between two captures.

Every price event

3 verified events, newest first. No price moves. Documented since .

  1. Prices added · first seen by

    • Batch cached input added at $0.0625
    Rates from first seen by December 11, 2025
    RatePer 1M tokens
    Standard
    Input$1.25
    Cached input$0.125
    Output$10.00
    Batch
    Input$0.625
    Cached input$0.0625
    Output$5.00

    Batch cached input added: first seen in the platform docs Batch table of 2025-12-11 (earlier platform captures are client-rendered shells). The marketing page's 50% statement covers inputs and outputs only, so the start is unknown and no notBefore is set.

  2. Prices added · first seen by

    Rates from first seen by November 18, 2025
    RatePer 1M tokens
    Standard
    Input$1.25
    Cached input$0.125
    Output$10.00
    Batch
    Input$0.625
    Output$5.00

    First official capture listing GPT-5.1 at all (2025-11-18), with the page's rule 'Save 50% on inputs and outputs with the Batch API'; batch input and output are derived from it. No capture shows GPT-5.1 without it, so no notBefore. The launch post says 'Pricing and rate limits are the same as GPT‑5' but doesn't mention batch, and the changelog entry doesn't tag v1/batch, so the batch start isn't dated to launch.

    • Price: Archived page (openai.com, captured November 18, 2025)
      quote
      Flagship models ... GPT-5.1 The best model for coding and agentic tasks across industries Price Input: $1.250 / 1M tokens Cached input: $0.125 / 1M tokens Output: $10.000 / 1M tokens ... Pricing reflects standard processing rates. To optimize cost and performance for different use cases, we also offer: Batch API : Save 50% on inputs and outputs with the Batch API and run tasks asynchronously over 24 hours.
    • Price: Archived page (platform.openai.com, captured December 11, 2025)
      quote
      Batch Model Input Cached input Output gpt-5.1 $0.625 $0.0625 $5.00

  3. Launch price ·

    Rates from November 13, 2025
    RatePer 1M tokens
    Input$1.25
    Cached input$0.125
    Output$10.00

    Pricing-page capture five days after launch (2025-11-18); the launch post says pricing is the same as GPT-5 ($1.25 / $0.125 / $10).

Gaps in this history

Batch start not dated: first seen on the 2025-11-18 pricing capture, five days after launch. Batch cached-input price first seen 2025-12-11.

API ids

Checked .