AI Model Watch
Models / OpenAI

GPT-5.6 Sol

GA

Current OpenAI flagship — the top 'Sol' tier of the GPT-5.6 family (Sol/Terra/Luna), GA on the API + Codex 2026-07-09 (preview from 2026-06-26). Text+image input, text output, configurable reasoning effort. Priced identically to GPT-5.5 ($5/$0.50/$30) but stronger on coding/knowledge-work/cyber/science per OpenAI. New caching model: explicit cache breakpoints, 30-min min cache life, cache writes billed 1.25x uncached input, reads keep the 90% discount. Standard tier ($5.00/$0.50/$30.00) re-confirmed against the pricing page and the model page 2026-08-08; cache write $6.25/M. Prompts >272K input tokens are billed at 2x input / 1.5x output for the whole request (stated on the model page). Batch ~50%.

GPT-5.6 Sol by OpenAI costs $5 per 1M input tokens and $30 per 1M output tokens ($11.25/1M blended), with a 1.1M (1.050.000-token) context window. It is generally available (GA), with a knowledge cutoff of 16 Feb 2026.

Last verified: 13 Aug 2026 · sourced from official provider documentation

Provider
OpenAI
Status
GA
Input price
$5 / 1M tokens
Output price
$30 / 1M tokens
Cached input
$0.5 / 1M tokens
Blended price
$11.25 / 1M tokens
Context window
1.050.000 tokens (1.1M)
Max output
128.000 tokens
Modality
text, image
Open weights
No — API only
Knowledge cutoff
2026-02-16
Released
9 Jul 2026
API string
gpt-5.6-sol

Source: OpenAI official documentation ↗

See also

Compare GPT-5.6 Sol head-to-head

GPT-5.6 Sol vs Claude Opus 4.8→

$11.25 vs $10 blended /M · cross-provider

GPT-5.6 Sol vs Gemini 3.6 Flash→

$11.25 vs $3 blended /M · cross-provider

GPT-5.6 Sol vs Grok 4.5→

$11.25 vs $3 blended /M · cross-provider

GPT-5.6 Sol vs Mistral Large 3→

$11.25 vs $0.75 blended /M · cross-provider

GPT-5.6 Sol vs Amazon Nova Pro→

$11.25 vs $1.40 blended /M · cross-provider

GPT-5.6 Sol vs Qwen-Max (Qwen2.5-Max)→

$11.25 vs $2.80 blended /M · cross-provider

FAQ

GPT-5.6 Sol — questions & answers

How much does GPT-5.6 Sol cost?

GPT-5.6 Sol is priced at $5 per 1M input tokens and $30 per 1M output tokens ($11.25/1M blended at a 3:1 input-to-output ratio), with cached input at $0.5 per 1M tokens.

What is the context window of GPT-5.6 Sol?

GPT-5.6 Sol has a 1.050.000-token context window (1.1M), with up to 128.000 output tokens per request.

Is GPT-5.6 Sol deprecated?

No — GPT-5.6 Sol is generally available (GA) and not currently scheduled for deprecation or retirement in our tracker.

Does GPT-5.6 Sol support image or vision input?

Yes — GPT-5.6 Sol accepts image input. Listed modalities: text, image.

Can I self-host GPT-5.6 Sol?

No — GPT-5.6 Sol is proprietary. Its weights are not publicly released, so it is available only through OpenAI's API (or hosted partners), not for self-hosting.

What is the API model string for GPT-5.6 Sol?

The API model identifier for GPT-5.6 Sol is "gpt-5.6-sol" when calling OpenAI's API.

What is GPT-5.6 Sol's knowledge cutoff?

GPT-5.6 Sol's training knowledge cutoff is 16 Feb 2026.