GPT-5.6 Sol vs Claude Opus 4.8
How GPT-5.6 Sol (OpenAI) and Claude Opus 4.8 (Anthropic) 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 Claude Opus 4.8 suits complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning. On price it's $5.00 vs $5.00 per 1M input tokens; on context, ~1M tokens (128K max output) vs 1M tokens.
Verdict
GPT-5.6 Sol is the more capable pick (Bq score 96 vs 93). Choose Claude Opus 4.8 if its fit is closer to your workload: complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning.
| Spec | GPT-5.6 Sol | Claude Opus 4.8 |
|---|---|---|
| Developer | OpenAI | Anthropic |
| Context window | ~1M tokens (128K max output) | 1M tokens |
| Input price /1M | $5.00 | $5.00 |
| Output price /1M | $30.00 | $25.00 |
| Modalities | text, image | text, image |
| Best for | The highest-stakes reasoning, deep agents and frontier coding where capability outweighs cost. | Complex coding agents, long-horizon tasks, and workloads needing top reliability and reasoning. |
GPT-5.6 Sol
- Frontier reasoning and agentic workflows
- New Ultra subagent + Max reasoning modes
- ~1M context window
- Strong coding and tool use
Claude Opus 4.8
- Best-in-class coding and agentic tasks
- Adaptive reasoning with effort controls
- 1M context at flat rate
- Strong instruction following and safety