lmprices

OpenAIGPT-5.6 Sol API pricing

GPT-5.6 Sol costs $4.00 per 1M input tokens and $20.00 per 1M output tokens on OpenAI's API, since .

Current price

Rates in effect since (prices added). Every price links to its source.

Input
$4.00
Output
$20.00
Blended 3:1
$8.00
GPT-5.6 Sol current rates per 1M tokens
Rate≤272K tokens>272K tokens
Standard
Input$4.00$8.00
Cached input$0.40$0.80
Cache write (30 min)$5.00$10.00
Cache write (12 hours)$10.00$20.00
Output$20.00$30.00
Batch
Input$2.00$4.00
Cached input$0.20$0.40
Cache write (30 min)$2.50$5.00
Cache write (12 hours)$5.00$10.00
Output$10.00$15.00

Launch price

GPT-5.6 Sol launched at this price on .

Input
$5.00
Output
$30.00
Blended 3:1
$11.25

Price history

InputOutput
$0$10$20$30Aug 2026Sep 2026Oct 2026 Input $5.00, from July 9, 2026Input $4.00, from August 21, 2026Output $30.00, from July 9, 2026Output $20.00, from August 21, 2026Output $20.00Input $4.00 $0$10$20$30Sep 2026 Input $5.00, from July 9, 2026Input $4.00, from August 21, 2026Output $30.00, from July 9, 2026Output $20.00, from August 21, 2026Output $20.00Input $4.00
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. 1 price move. Documented since .

  1. Prices added ·

    • Cache write (12 hours), ≤272K tokens added at $10.00
    • Cache write (12 hours), >272K tokens added at $20.00
    • Batch cache write (12 hours), ≤272K tokens added at $5.00
    • Batch cache write (12 hours), >272K tokens added at $10.00
    Rates from October 20, 2026
    Rate≤272K tokens>272K tokens
    Standard
    Input$4.00$8.00
    Cached input$0.40$0.80
    Cache write (30 min)$5.00$10.00
    Cache write (12 hours)$10.00$20.00
    Output$20.00$30.00
    Batch
    Input$2.00$4.00
    Cached input$0.20$0.40
    Cache write (30 min)$2.50$5.00
    Cache write (12 hours)$5.00$10.00
    Output$10.00$15.00

    12-hour cache write added: standard and batch, both context tiers, from the live pricing table (2.5x input, as the changelog states). All earlier rates unchanged; the existing cache_write (cacheTtl "30m") is the default 30-minute write ('30m write' on the page from 2026-10-20). The 2026-10-15 capture (20261015084552) still shows a single 'Cache writes' column; the 2026-10-26 capture (20261026192814) shows '30m write' and '12h write'. The guide says 12-hour retention is a Responses API option; the Batch table prices it anyway.

    • Price: Pricing page (developers.openai.com)
      quote
      Standard and Batch tables, columns: Model | Short context input | output | cached input | 30m write | 12h write | Long context input | output | cached input | 30m write | 12h write. Standard: | gpt-5.6-sol | $4.00 | $20.00 | $0.40 | $5.00 | $10.00 | $8.00 | $30.00 | $0.80 | $10.00 | $20.00 | Batch: | gpt-5.6-sol | $2.00 | $10.00 | $0.20 | $2.50 | $5.00 | $4.00 | $15.00 | $0.40 | $5.00 | $10.00 | Short context: ≤272K input tokens. Long context: >272K input tokens.
    • Price: Documentation (developers.openai.com)
      quote
      For GPT-5.6 and later, cache writes cost 1.25× the standard, uncached input-token rate for the default 30-minute lifetime. In the Responses API, you can choose a 12-hour minimum lifetime at a write rate of 2.5× ordinary input.
    • Date: Changelog (developers.openai.com)
      quote
      October, 2026 / Oct 20 / Feature · API: v1/responses / You can now choose 12-hour prompt caching in the API. ... 12-hour cache writes cost 2.5x the input token price.

  2. Price change ·

    Rates from August 21, 2026
    Rate≤272K tokens>272K tokens
    Standard
    Input$4.00$8.00
    Cached input$0.40$0.80
    Cache write (30 min)$5.00$10.00
    Output$20.00$30.00
    Batch
    Input$2.00$4.00
    Cached input$0.20$0.40
    Cache write (30 min)$2.50$5.00
    Output$10.00$15.00
    • Price: Archived page (developers.openai.com, captured August 22, 2026)
      quote
      Standard: gpt-5.6-sol | $4.00 | $0.40 | $5.00 | $20.00 | $8.00 | $0.80 | $10.00 | $30.00. Batch: gpt-5.6-sol | $2.00 | $0.20 | $2.50 | $10.00 | $4.00 | $0.40 | $5.00 | $15.00
    • Price: Pricing page (developers.openai.com)
      quote
      gpt-5.6-sol | $4.00 | $20.00 | $0.40 | $5.00 | $10.00
    • Price: Changelog (developers.openai.com)
      quote
      Aug 21 ... GPT-5.6 Sol now costs $4 per million input tokens and $20 per million output tokens, representing 20% lower input pricing and 33% lower output pricing. GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026.
    • Price: Archived page (developers.openai.com, captured July 11, 2026)
      quote
      For GPT-5.6 models and later model families, cache writes cost 1.25× the uncached input token rate. ... For GPT-5.6 models and later model families, use prompt_cache_options.ttl to set the minimum lifetime of all breakpoints written by the request. The only supported value is 30m, which is also the default. A cached prefix remains eligible for reuse for at least 30 minutes, but OpenAI may retain it longer.
    • Date: Changelog (developers.openai.com)
      quote
      Aug 21 ... GPT-5.6 Sol now costs $4 per million input tokens and $20 per million output tokens, representing 20% lower input pricing and 33% lower output pricing. GPT-5.6 Sol’s promotional pricing is available at least through November 21, 2026.

  3. Launch price ·

    Rates from July 9, 2026
    Rate≤272K tokens>272K tokens
    Standard
    Input$5.00$10.00
    Cached input$0.50$1.00
    Cache write (30 min)$6.25$12.50
    Output$30.00$45.00
    Batch
    Input$2.50$5.00
    Cached input$0.25$0.50
    Cache write (30 min)$3.125$6.25
    Output$15.00$22.50

    Launch-day capture (2026-07-09 17:50 UTC).

    • Price: Archived page (developers.openai.com, captured July 9, 2026)
      quote
      Standard | Short context | Long context | Model | Input | Cached input | Cache writes | Output | ... gpt-5.6-sol | $5.00 | $0.50 | $6.25 | $30.00 | $10.00 | $1.00 | $12.50 | $45.00. Batch: gpt-5.6-sol | $2.50 | $0.25 | $3.125 | $15.00 | $5.00 | $0.50 | $6.25 | $22.50
    • Price: Archived page (developers.openai.com, captured July 11, 2026)
      quote
      For GPT-5.6 models and later model families, cache writes cost 1.25× the uncached input token rate. ... For GPT-5.6 models and later model families, use prompt_cache_options.ttl to set the minimum lifetime of all breakpoints written by the request. The only supported value is 30m, which is also the default. A cached prefix remains eligible for reuse for at least 30 minutes, but OpenAI may retain it longer.
    • Date: Changelog (developers.openai.com)
      quote
      Jul 9 ... Released the [GPT-5.6 model family](https://developers.openai.com/api/docs/guides/latest-model?model=gpt-5.6), including GPT-5.6 Sol for frontier capability, GPT-5.6 Terra for a balance of intelligence and cost, and GPT-5.6 Luna for efficient, high-volume workloads. The `gpt-5.6` alias routes requests to `gpt-5.6-sol`.

Gaps in this history

None known.

API ids

Checked .