GPT-5.6 Sol
OpenAI · Multimodal · Released Jul 2026
OpenAI's flagship reasoning model in the GPT-5.6 series, designed for complex analytical and logical tasks with a 1.05M token context window.
- Strengths
- Excels at multi-step reasoning, problem decomposition, and deep analytical work across diverse domains.
- Best for
- Complex reasoning tasks, technical problem-solving, and end-to-end analytical workflows where reasoning quality matters more than speed.
- Limitations
- Slower than the lightweight Luna and midrange Terra models in the same series; for real-time applications or simple tasks, lighter alternatives are more practical.
Input / 1M
$2.00
Output / 1M
$10.00
Cached input / 1M
$0.2
Context window
1.05M
Also billed
- Cache write
- $2.50 / 1M
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in — out —
- 90d
- in decreased 60.0% out decreased 66.7%
- 1y
- in decreased 60.0% out decreased 66.7%
- Since launch
- in decreased 60.0% out decreased 66.7%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 22 Aug 2026 | $2.00 | $10.00 | $0.2 | Imported from OpenRouter | openrouter.ai |
| 17 Aug 2026 | $2.50 | $15.00 | $0.25 | Imported from OpenRouter | openrouter.ai |
| 10 Jul 2026 | $5.00 | $30.00 | $0.5 | Imported from OpenRouter | openrouter.ai |