GPT-5.6 Sol vs GPT-5.5
How GPT-5.6 Sol (OpenAI) and GPT-5.5 (OpenAI) compare on price, context window and best-fit use case.
In short: GPT-5.6 Sol is best for the highest-stakes reasoning, deep agents and frontier coding where capability outweighs cost, while GPT-5.5 suits highest-stakes reasoning, complex agents, and frontier coding tasks where capability outweighs cost. On price it's $5.00 vs $5.00 per 1M input tokens; on context, ~1M tokens (128K max output) vs ~1.05M tokens (128K max output).
Verdict
GPT-5.6 Sol is the more capable pick (Bq score 96 vs 95). Choose GPT-5.5 if its fit is closer to your workload: highest-stakes reasoning, complex agents, and frontier coding tasks where capability outweighs cost.
| Spec | GPT-5.6 Sol | GPT-5.5 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | ~1M tokens (128K max output) | ~1.05M tokens (128K max output) |
| Input price /1M | $5.00 | $5.00 |
| Output price /1M | $30.00 | $30.00 |
| Modalities | text, image | text, image |
| Best for | The highest-stakes reasoning, deep agents and frontier coding where capability outweighs cost. | Highest-stakes reasoning, complex agents, and frontier coding tasks where capability outweighs cost. |
GPT-5.6 Sol
- Frontier reasoning and agentic workflows
- New Ultra subagent + Max reasoning modes
- ~1M context window
- Strong coding and tool use
GPT-5.5
- State-of-the-art reasoning and agentic workflows
- 1M+ context window
- Strong coding and tool use
- Multimodal (text + image input)