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

An alias. The provider can point it at a newer version.

gpt-5.6-sol

Updated Oct 20, 2026

Sources & notes

Capabilities & limits

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

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 8 rates

All prices in USD.

Short-context input

$4.00 per 1M tokens

prompt ≤ 272K input tokens

Short-context output

$20.00 per 1M tokens

prompt ≤ 272K input tokens

Cached input

$0.40 per 1M tokens

prompt ≤ 272K input tokens

Cache writes

$5.00 per 1M tokens

prompt ≤ 272K input tokens

Long-context input

$8.00 per 1M tokens

prompt > 272K input tokens
rate applies to the full request

Long-context output

$30.00 per 1M tokens

prompt > 272K input tokens
rate applies to the full request

Long-context cached input

$0.80 per 1M tokens

prompt > 272K input tokens
rate applies to the full request

Long-context cache writes

$10.00 per 1M tokens

prompt > 272K input tokens
rate applies to the full request

Other tiers per 1M tokens (short context): Batch: $2 input / $10 output / $0.2 cached; Flex: $2 input / $10 output / $0.2 cached; Fast mode: $8 input / $40 output / $0.8 cached. Regional processing (data residency) endpoints add a 10% uplift. Cache writes are billed at 1.25x the uncached input rate. Promotional pricing (a 20% input / 33% output reduction from Aug 21, 2026) is available at least through November 21, 2026.

Price history

Jul 9, 2026

Input — per million tokens

Aug 21, 2026

Input $4.00 per million tokens

Sep 23, 2026

Input $4.00 per million tokens

Jul 9, 2026

Output — per million tokens

Aug 21, 2026

Output $20.00 per million tokens

Sep 23, 2026

Output $20.00 per million tokens

Technical details

Parameters: Not published
Active parameters: Not published
Architecture: Not published
Training / knowledge cutoff: Feb 16, 2026
Input modalities: Text, image
Output modalities: Text

From OpenAI

Official announcement ↗

How they describe it

Flagship model for complex professional work

Release & lifecycle

First available: Jul 9, 2026
available: As of Sep 13, 2026
available: As of Oct 20, 2026

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