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Model Watch · OpenAI
GPT-5.6 Sol
The one most people are actually calling while Astra rolls out. OpenAI says the promotional price holds until at least 21 November 2026.
Status
released
Released
9 July 2026
Context
1050K tokens
Price / 1M
$4.00 in, $20.00 out
Mentions
3
Threads
2
What is GPT-5.6 Sol?
GPT-5.6 Sol is a model from OpenAI, built in the US. It's out, and you can call it today.
When did GPT-5.6 Sol come out?
OpenAI released it on 9 July 2026. That date comes from the lab's own docs.
The tracker first logged the name on 6 August 2026 and last saw it on 13 August 2026.
What does it cost, and how much context does it hold?
| Lab | OpenAI |
|---|---|
| Built in | US |
| Status | released |
| API model id | gpt-5.6-sol |
| Released | 9 July 2026 |
| Context window | 1050K tokens |
| Max output | 128K tokens |
| Input, per 1M tokens | $4.00 |
| Output, per 1M tokens | $20.00 |
List prices per million tokens, read off the lab's own docs. Caching, batching and volume deals all cut the real number, so treat this as the ceiling. Check the source before you budget against it.
How does it compare to OpenAI's other models?
| Model | Status | Date | Context | In / 1M | Out / 1M |
|---|---|---|---|---|---|
| GPT-5.6 Sol | released | 9 July 2026 | 1050K tokens | $4.00 | $20.00 |
| GPT-6 Astra | released | 3 September 2026 | 1050K tokens | $10.00 | $50.00 |
| GPT-5.6 Terra | released | 9 July 2026 | 1050K tokens | $2.00 | $12.00 |
| GPT-5.6 Luna | released | 9 July 2026 | 1050K tokens | $0.20 | $1.20 |
| GPT-5.5 | released | 23 April 2026 | 1050K tokens | $5.00 | $30.00 |
| GPT-5.4 nano | released | 17 March 2026 | 400K tokens | $0.20 | $1.25 |
| GPT-5.4 Mini | released | 17 March 2026 | 400K tokens | $0.75 | $4.50 |
| GPT-5.4 | released | 5 March 2026 | 1050K tokens | $2.50 | $15.00 |
| GPT-5.3-Codex | released | 5 February 2026 | 400K tokens | $1.75 | $14.00 |
| GPT-5.2 | released | 11 December 2025 | 400K tokens | $1.75 | $14.00 |
| GPT-5.1 | released | 13 November 2025 | 400K tokens | $1.25 | $10.00 |
| GPT-5 | deprecated | 7 August 2025 | 400K tokens | $1.25 | $10.00 |
| o3 | deprecated | 16 April 2025 | 200K tokens | $2.00 | $8.00 |
| GPT-5.5 Pro | released | — | 1050K tokens | $30.00 | $180.00 |
A dash means the lab hasn't published that number for that model.
What are people discussing about GPT-5.6 Sol?
We tracked 2 public discussions naming GPT-5.6 Sol across r/singularity between 8 August 2026 and 2 September 2026.
None of them settled on a single subject clearly enough to group, so there is nothing more specific to report yet.
Every mention we've logged
Every tracked post, release, changelog entry or incident whose title or summary names GPT-5.6 Sol. Newest first, each one linking to where the lab published it.
Thu 13 Aug 2026
1Mon 10 Aug 2026
1Model ML completes finance work more efficiently with GPT-5.6 Sol
Model ML uses GPT-5.6 Sol to carry finance work from research and analysis through editable, traceable PowerPoint decks and Excel workbooks.
Thu 06 Aug 2026
1Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users
ChatGPT introduces improved GPT-5.6 Sol with better accuracy and consistency, plus expanded access for free users and unlimited everyday chats with GPT-5.6 Luna.
Keep reading
The release timeline is every model we know about, filterable by lab, country and date. The tracker is the live feed these mentions come from, and Model Watch is the whole catalogue on one page.
More from OpenAI:
- GPT-6 Astra · released
- GPT-5.6 Terra · released
- GPT-5.6 Luna · released
- GPT-5.5 · released
- GPT-5.4 nano · released
- GPT-5.4 Mini · released
- GPT-5.4 · released
- GPT-5.3-Codex · released
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