GPT-5.6 Sol

Available

Configurable reasoning with text and image input. The undated model ID is not a pinned snapshot.

Access details: OpenAI · Responses API

Undated identifier · Undated API identifier. This pilot does not claim an immutable weights snapshot behind it.

gpt-5.6-sol

Source check: Sep 13, 2026

Sources & notes →

Capabilities & limits

Context window: 1.05M
Maximum output: 128K
Image input: Supported
Tool calling: Supported
Structured output: Supported

Documented interfaces and limits. These are not measures of model quality.

Pricing

USD / 1M tokens

Input: $4.00
Output: $20.00

Standard text rates; promotional pricing published at least through November 21, 2026. Above 272K input tokens, different rates apply. Cache, batch, tools, and regional premiums are excluded.

Full rate card 6 rates

Amounts in USD. Check the unit and conditions on each rate.

Standard input

$4.00 per 1M tokens

standard processing
excludes cached input
excludes Batch API
excludes tool fees

Standard output

$20.00 per 1M tokens

standard processing
excludes Batch API
excludes tool fees

Cached input

$0.40 per 1M tokens

prompt caching

Cache writes

$5.00 per 1M tokens

1.25x uncached input rate

Long-context input

$8.00 per 1M tokens

request has more than 272K input tokens
rate applies to the full request

Long-context output

$30.00 per 1M tokens

request has more than 272K input tokens
rate applies to the full request

Prompts over 272K input tokens: 2x input and 1.5x output; Promotional pricing available at least through November 21, 2026

Price history

Jul 9, 2026

Input Not verified per million tokens

Earlier amount is not verified; the current rate cannot fill this historical gap.

Aug 21, 2026

Input $4.00 per million tokens

Jul 9, 2026

Output Not verified per million tokens

Earlier amount is not verified; the current rate cannot fill this historical gap.

Aug 21, 2026

Output $20.00 per million tokens

Technical details

Training / knowledge cutoff: Feb 16, 2026
Input modalities: text, image
Output modalities: text

3 details not verified

Parameters
Active parameters
Architecture

Audio and video are not supported. The model page documents reasoning support.

From OpenAI

Official announcement link: not verified yet.

How they describe it

Flagship model for complex professional work

What they say is different

Provider quote not captured yet.

Verbatim provider claims · not an independent assessment

Release & lifecycle

Availability applies to this exact identifier on OpenAI · Responses API.

First API availability: Jul 9, 2026
available: Observed Sep 13, 2026

PredecessorGPT-5.5 →Compare with predecessor →Read the Atlas release story ↗