Very long inputs
Choose GPT-5.6 Sol
GPT-5.6 Sol reads up to 1.05M tokens per request, against 200k for Claude Sonnet 3.5.
Claude Sonnet 3.5 vs GPT-5.6 Sol: price, context and capabilities
Choose GPT-5.6 Sol for very long inputs and the latest release; on the other points the two are level or the data is missing.
In short
- Claude Sonnet 3.5 has been retired; GPT-5.6 Sol is the one you can still call.
- A price comparison is not possible: one of them has no comparable published price.
- GPT-5.6 Sol reads more per request: 1.05M tokens against 200k.
- GPT-5.6 Sol is the newer model (Jul 9, 2026, against June 2024).
- Only GPT-5.6 Sol offers reasoning, prompt caching.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Latest release
Choose GPT-5.6 Sol
GPT-5.6 Sol is the newer release (Jul 9, 2026, against June 2024 for Claude Sonnet 3.5).
Specifications side by side
| Claude Sonnet 3.5 | GPT-5.6 Sol | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Category | Language models | Language models |
| Status | Retired | Generally available |
| Headline price | $6.00 / 1M tokens | $8.00 / 1M tokens |
| Input | $3.00 / 1M tokens | $4.00 / 1M tokens |
| Output | $15.00 / 1M tokens | $20.00 / 1M tokens |
| Cached input | No data | $0.40 / 1M tokens |
| Context window | 200k | 1.05M |
| Max output | No data | 128k |
| Released | June 2024 | Jul 9, 2026 |
| Knowledge cutoff | No data | February 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | claude-3-5-sonnet-20240620 | gpt-5.6-sol |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Sonnet 3.5 | GPT-5.6 Sol |
|---|---|---|
| Intelligence Index | No data | 47 |
| Terminal-Bench Hard | No data | 65.9% |
| SciCode | No data | 57.1% |
| GPQA Diamond | No data | 94.1% |
| Humanity's Last Exam | No data | 49.5% |
| IFBench (instruction following) | No data | 72.7% |
| τ²-Bench (agentic tool use) | No data | 85.1% |
| MMMU-Pro (visual reasoning) | No data | 83.4% |
| Long-context reasoning (AA-LCR) | No data | 84% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Sonnet 3.5 or GPT-5.6 Sol?
Choose GPT-5.6 Sol for very long inputs and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Claude Sonnet 3.5 or GPT-5.6 Sol?
A price comparison is not possible: one of them has no comparable published price.
Which has the larger context window, Claude Sonnet 3.5 or GPT-5.6 Sol?
GPT-5.6 Sol reads more per request: 1.05M tokens against 200k.
What is the difference between Claude Sonnet 3.5 and GPT-5.6 Sol?
Claude Sonnet 3.5 is made by Anthropic and GPT-5.6 Sol by OpenAI. Claude Sonnet 3.5 has been retired; GPT-5.6 Sol is the one you can still call. A price comparison is not possible: one of them has no comparable published price. GPT-5.6 Sol reads more per request: 1.05M tokens against 200k. GPT-5.6 Sol is the newer model (Jul 9, 2026, against June 2024). Only GPT-5.6 Sol offers reasoning, prompt caching.
Which is newer, Claude Sonnet 3.5 or GPT-5.6 Sol?
GPT-5.6 Sol was released on Jul 9, 2026 and Claude Sonnet 3.5 on June 2024.