LLM Comparison
Claude Sonnet 5.5 vs GPT-6 Sol
Side-by-side specs, pricing & capabilities · Updated September 2026
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2/6 models| Organization | ||
| OpenTools Score | ||
| Family | Claude Sonnet | GPT-6 |
| Status | Current | Current |
| Release Date | Sep 2026 | Sep 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $2.00/M tokens | $2.00/M tokens |
| Output Price | $10.00/M tokens | $10.00/M tokens |
| Pricing Notes | Anthropic Claude API standard tier, USD per million tokens: $2 input, $10 output; 5-minute cache writes $2.50, 1-hour cache writes $4, cache reads $0.20. Batch API gives 50% off input and output. A 300K output limit is available only for Message Batches API with the output-300k-2026-03-24 beta header; standard maximum output is 128K. Provider and regional terms may vary. | OpenAI standard API, USD per million tokens for prompts up to 272K input tokens: $2 input, $0.20 cached input, $2.50 cache writes, $10 output. Above 272K input tokens, the full request costs 2x input/cache and 1.5x output. Batch/Flex cost 50% of Standard; Fast costs 2x; regional processing adds 10% where available. Reasoning output tokens are charged at output rates. |
| Capabilities | textvisionreasoningcodingtool-uselong-contextcontext-caching | textvisionreasoningcodingtool-uselong-contextcontext-caching |
| Training Cutoff | 2026-06 | 2026-04-20 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-sonnet-5-5 | gpt-6-sol |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3.2 | 55.9779549012591artificial-analysis | 47.5276426437724artificial-analysis |
| View Claude Sonnet 5.5 | View GPT-6 Sol | |
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Sonnet 5.5Cheapest | $2.00 | $5.00 | $7.00 | — |
| GPT-6 SolCheapest | $2.00 | $5.00 | $7.00 | — |
Anthropic
Claude Sonnet 5.5
Claude Sonnet 5.5 is Anthropic's proprietary adaptive-reasoning model. The Claude API identifier is claude-sonnet-5-5. It accepts text and images, returns text, has a 1,000,000-token context window and a 128,000-token standard output limit. Anthropic lists standard API input and output pricing at $2 and $10 per million tokens.
OpenAI
GPT-6 Sol
GPT-6 Sol is OpenAI's reasoning model for professional work. It accepts text and images, produces text, supports a 1,050,000-token context window and 128,000 output tokens, and is available through the Responses and Chat Completions APIs. OpenAI documents the exact gpt-6-sol identifier and standard token pricing.
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