LLM Comparison
Claude Sonnet 5.5 vs GPT-5.6 Sol
Side-by-side specs, pricing & capabilities · Updated September 2026
Add to comparison
2/6 models| Organization | ||
| OpenTools Score | 85 7.1 | |
| Family | Claude Sonnet | GPT-5.6 |
| Status | Current | Current |
| Release Date | Sep 2026 | Jul 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $2.00/M tokens | $4.00/M tokens |
| Output Price | $10.00/M tokens | $20.00/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 promotional standard short-context pricing is $4 input, $0.40 cached input, $5 cache writes, and $20 output per 1M tokens through at least November 21, 2026. Standard long-context pricing is $8 input, $0.80 cached input, $10 cache writes, and $30 output; Batch, Flex, and Fast mode use separate rates. |
| Capabilities | textvisionreasoningcodingtool-uselong-contextcontext-caching | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Training Cutoff | 2026-06 | Feb 16, 2026 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-sonnet-5-5 | gpt-5.6-sol |
| Benchmarks | ||
| Artificial Analysis Intelligence Index v4.3.2 | 55.9779549012591artificial-analysis | — |
| Artificial Analysis Intelligence Index | — | 59artificial-analysis |
| Artificial Analysis Coding Agent Index | — | 80artificial-analysis |
| Artificial Analysis Intelligence Index v4.1.1 | — | 61artificial-analysis |
| Artificial Analysis Intelligence Index v4.3 | — | 47https://artificialanalysis.ai/models/gpt-5-6-sol |
| GPQA Diamond | — | 94.1414artificial-analysis |
| SciCode | — | 57.0602artificial-analysis |
| Terminal-Bench 2.1 | — | 88.015artificial-analysis |
| View Claude Sonnet 5.5 | View GPT-5.6 Sol | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Sonnet 5.5Cheapest | $2.00 | $5.00 | $7.00 | — |
| GPT-5.6 Sol | $4.00 | $10.00 | $14.00 | +100% |
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-5.6 Sol
GPT-5.6 Sol is OpenAI frontier GPT-5.6 model for complex professional work across coding, knowledge work, science, cybersecurity, and agentic workflows. OpenAI model docs list it as the GPT-5.6 alias target with function, web search, file search, and computer use tools, 1.05M context, and 128K max output.
More Comparisons
Looking for more AI models?
Browse All LLMs