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GPT-5.6 Sol

OpenAI · GPT line · flagship

Released July 9, 2026Replaced by GPT-6 Astra

What changed

The most capable of the three GPT-5.6 models (Sol, Terra and Luna), priced at $5 per million input tokens and $30 per million output tokens.

Sources: OpenAI · CNBC

Where the GPT line stands

GPT-6 Astra is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

GPT-6 Astra

OpenAI · GPT line · flagship
Just releasedreleased 6 days ago — usual gap is ~56

OpenAI's new flagship: far fewer made-up answers and a third of the tokens on coding-agent work, but the same overall score as GPT-5.6 Sol — at 2.5 times the price.

Released Sep 3, 2026 · what changed →
Days since last release
GPT-6 Astra · Sep 3, 2026
6
days
Usual gap
56
days
Recent gaps
GPT-5.6 Sol · Jul 2026
56
GPT-5.5 · Apr 2026
77
GPT-5.4 · Mar 2026
49
GPT-5.2 · Dec 2025
84

Every GPT release

Newest first. See the full line with every card →

  1. Sep 3, 2026GPT-6 Astra
  2. Jul 9, 2026GPT-5.6 Sol · this page
  3. Apr 23, 2026GPT-5.5
  4. Mar 5, 2026GPT-5.4
  5. Dec 11, 2025GPT-5.2
  6. Nov 12, 2025GPT-5.1
  7. Aug 7, 2025GPT-5
  8. Apr 16, 2025o3
  9. Apr 14, 2025GPT-4.1
  10. Dec 5, 2024o1
  11. May 13, 2024GPT-4o
  12. Nov 6, 2023GPT-4 Turbo
  13. Mar 14, 2023GPT-4
  14. Nov 30, 2022GPT-3.5
  15. Jun 11, 2020GPT-3

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