Pricing · OpenAI

GPT-5.6 Sol

OpenAI's gpt-5.6-sol, 1.1M tokens of context. Every number on this page was read off OpenAI's own pricing page — never estimated, never recalled from memory.

Promotional pricing, at least through November 21, 2026. Every price on this page, including the long-context tier, is the promotional one. OpenAI publishes no list price for after the promotion, so none is shown here: this site does not compute prices. What OpenAI states is quoted in the note below.

Pricing

Long-prompt tiers

Pricing changes above a prompt-size threshold. If your average request is near the boundary, the effective rate is not the headline rate.

At the calculator's starting volume, 1M input tokens and 200K output tokens with no cache hits, GPT-5.6 Sol costs $8.00: $4.00 for input and $4.00 for output, at the promotional prices above. Same formula as the calculator; change the volume there.

Where this price sits

$4.00 per 1M input tokens (for prompts up to 272K tokens) is the 53rd cheapest input price of the 67 current models with a verified price on this site, and the 7th of OpenAI's 11. Output costs 5.0× the input price.

Other current models in the GPT-5.6 family:

• GPT-5.6 Luna 1.1M tokens $0.20 in · $1.20 out
• GPT-5.6 Terra 1.1M tokens $2.00 in · $12.00 out
• GPT-5.6 Cyber 400K tokens $12.50 in · $75.00 out

Other price lists OpenAI publishes for GPT-5.6 Sol

The prices above are OpenAI's Standard list, the one the table and the calculator use. OpenAI also sells GPT-5.6 Sol on 3 other lists, each with a condition. Figures and wording are quoted from OpenAI's own pages as read on the date shown; this site computes none of them.

• Batch · half of Standard on every column · wait: results within 24 hours

  Printed for GPT-5.6 Sol: $2.00 input, $0.20 cached input, $2.50 cache write, $10.00 output, per 1M tokens.

  Learn how to use OpenAI's Batch API to send asynchronous groups of requests with 50% lower costs, a separate pool of significantly higher rate limits, and a clear 24-hour turnaround time. Batches that do not complete in time eventually move to an expired state; unfinished requests within that batch are cancelled

  Source, read September 16, 2026

• Flex · half of Standard on every column, the same figures as Batch · accept slower responses and occasional unavailability

  Printed for GPT-5.6 Sol: $2.00 input, $0.20 cached input, $2.50 cache write, $10.00 output, per 1M tokens.

  Flex processing provides lower costs for Responses or Chat Completions requests in exchange for slower response times and occasional resource unavailability. Due to slower processing speeds with Flex processing, request timeouts are more likely.

  Source, read September 16, 2026

• Fast mode · double Standard on every column · pay more to be scheduled first

  Printed for GPT-5.6 Sol: $8.00 input, $0.80 cached input, $10.00 cache write, $40.00 output, per 1M tokens.

  Priority processing was renamed Fast mode on July 30, 2026. If your traffic ramps too fast, the system may downgrade some Fast mode requests to standard speeds and charge standard rates.

  Source, read September 16, 2026

Mentioned in

4 posts on this site cite GPT-5.6 Sol. The sentence is the post's own, taken from where it links here.

• Prompt Caching Is Not 10% Everywhere: What a Cache Hit Costs Across Eight Providers · September 16, 2026 · 2 mentions

  OpenAI, all eight current models: GPT-6 Astra $1.00 on $10.00, GPT-5.6 Sol $0.40 on $4.00, Terra $0.20 on $2.00, Luna $0.02 on $0.20, GPT-5.3 Codex $0.175 on $1.75, ChatGPT (chat-latest) $0.50 on $5.00, GPT-5.6 Cyber $1.25 on $12.50 and the access-restricted GPT-Rosalind $0.50 on $5.00, verified September 14, 2026, and September 16 for Astra and Rosalind.

• The Second Price List: What Batch, Flex, Priority and Data-Sharing Discounts Cost Across Seven Providers · September 16, 2026

  One caveat this site has already written about: GPT-5.6 Sol's Standard price of $4.00 / $20.00 is itself promotional, so its Batch and Flex figure of $2.00 / $10.00 is half of a promotion, not half of a list price.

• Five Things Decide What You Pay for a Model, and Only One of Them Is the Model · September 15, 2026 · 2 mentions

  When a provider publishes only the promotional figure, the page says so and shows no list price rather than a computed one: GPT-5.6 Sol is $4.00 and $20.00, which OpenAI describes as "a 20% reduction in input pricing and a 33% reduction in output pricing", promotional "at least through November 21, 2026", with no list figure printed anywhere (checked September 15, 2026).

• OpenAI's Pricing Page Has Four Tabs That Look the Same in Plain Text. We Published the Wrong One for Seven Days. · September 15, 2026

  The rows for GPT-5.6 Sol, Terra and Luna entered the dataset on September 3, 2026 at 17:11 UTC, in the commit that created the pricing table, with Sol at $2.00 / $10.00, Terra at $1.00 / $6.00 and Luna at $0.10 / $0.60.

Recorded price changes

Every change this site has recorded for GPT-5.6 Sol, with the date it took or takes effect and why. Corrections of our own reading are listed too, and say so.

• September 10, 2026 · correction of this site's reading · figure shown here up 2.0×

  Correction of our own reading, not a price change by OpenAI. From September 3 to September 10, 2026 this site published GPT-5.6 Sol at $2 / $10, Terra at $1 / $6 and Luna at $0.10 / $0.60 per million tokens, read from the Batch tab of OpenAI's pricing page, which is always 50% of Standard (the page's four tabs, Standard, Batch, Flex and Fast mode, look identical in plain text), and labelled as a promotion ending November 21 with double the price after it. The Standard short-context prices, verified by hand on September 10, are Sol $4 / $20, Terra $2 / $12 and Luna $0.20 / $1.20, and the published figures doubled to them. The November 21 date was OpenAI's, but it belongs to Sol alone and is not an end date: OpenAI states that Sol's $4 / $20 is promotional pricing, a 20% reduction on input and 33% on output, available at least through November 21, 2026, and publishes no list price for after it; Terra and Luna carry no promotion. On September 10 this entry wrongly said there was no promotion to end; corrected on September 15, when the Sol row got its promotion back, marked as at least through that date, without an invented list price.

  Source

Every price change recorded on this site →

Succession

OpenAI names GPT-5.6 Sol as the replacement for:

• o3 deprecated shutdown December 11, 2026
• GPT-5 deprecated shutdown December 11, 2026

Specifications

It returns up to 128K tokens per response, against a context window of 1.1M tokens.

Questions about GPT-5.6 Sol pricing

How much does GPT-5.6 Sol cost per million tokens?

$4.00 per 1M input tokens and $20.00 per 1M output tokens for prompts up to 272,000 tokens, read on OpenAI's official pricing page on September 28, 2026.

What does a cached input token cost on GPT-5.6 Sol?

$0.40 per 1M cached input tokens, 10% of the $4.00 input price; writing to the cache costs $5.00 per 1M tokens.

Does GPT-5.6 Sol cost more for long prompts?

Yes. For prompts over 272,000 tokens it costs $8.00 per 1M input tokens and $30.00 per 1M output tokens, $0.80 for cached input, against $4.00 and $20.00 below that.

Is GPT-5.6 Sol's price a promotion?

Yes. $4.00 input and $20.00 output are promotional prices at least through November 21, 2026; OpenAI publishes no list price for after the promotion.

OpenAI's model page states: "GPT-5.6 Sol costs $4 per million input tokens and $20 per million output tokens, a 20% reduction in input pricing and a 33% reduction in output pricing. GPT-5.6 Sol's promotional pricing is available at least through November 21, 2026." The prices on this page, including the long-context tier (2x input and 1.5x output of them, for the full request), are that promotional price. OpenAI publishes no list price for after the promotion, so none is shown here. Checked September 15, 2026.

Verified September 28, 2026 against OpenAI's official pricing page. Confidence: confirmed. How the data is checked.

Other OpenAI models with a verified price

• GPT-6 Luna GPT-6 $0.10 in · $0.50 out
• GPT-5.6 Luna GPT-5.6 $0.20 in · $1.20 out
• GPT-5.3 Codex Codex $1.75 in · $14.00 out
• GPT-6.1 Sol GPT-6 $2.00 in · $10.00 out
• GPT-6 Sol GPT-6 $2.00 in · $10.00 out
• GPT-5.6 Terra GPT-5.6 $2.00 in · $12.00 out
• GPT-Rosalind GPT-Rosalind $5.00 in · $25.00 out
• ChatGPT (chat-latest) GPT $5.00 in · $30.00 out
• GPT-6 Astra GPT-6 $10.00 in · $50.00 out
• GPT-5.6 Cyber GPT-5.6 $12.50 in · $75.00 out

Cheaper or equally priced alternatives

Current models with an input price at or below $4.00 per 1M tokens. The cheapest of these, Command R+ (08-2024), is 1.6× cheaper on input.

• Claude Opus 5.5 Anthropic $4.00 in · $20.00 out
• Claude Sonnet 4.6 Anthropic $3.00 in · $15.00 out
• Command A Cohere $2.50 in · $10.00 out
• Command R+ (08-2024) Cohere $2.50 in · $10.00 out

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