GPT-5.6 Sol Pro
retiredOpenAI · Multimodal · Released Jul 2026
GPT-5.6 Sol Pro is OpenAI's GPT-5.6 Sol model configured with pro-mode reasoning for more rigorous problem-solving on complex tasks.
- Strengths
- Handles complex reasoning tasks with extended thinking enabled at the pro level, providing more thorough analysis and higher-quality outputs.
- Best for
- Multi-step reasoning problems, research synthesis, and tasks requiring careful deliberation where extra computation time is justified.
- Limitations
- Pro-mode reasoning increases latency and token usage compared to standard reasoning modes, and works best with sufficient context for complex queries.
Input / 1M
$4.00
Output / 1M
$20.00
Cached input / 1M
$0.4
Context window
1.05M
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in decreased 20.0% out decreased 33.3%
- 90d
- in decreased 20.0% out decreased 33.3%
- 1y
- in decreased 20.0% out decreased 33.3%
- Since launch
- in decreased 20.0% out decreased 33.3%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 28 Sep 2026 | $4.00 | $20.00 | $0.4 | Imported from OpenRouter | openrouter.ai |
| 10 Jul 2026 | $5.00 | $30.00 | $0.5 | Imported from OpenRouter | openrouter.ai |