LLM Comparison
Claude Sonnet 5 vs GPT-5.6 Terra
Side-by-side specs, pricing & capabilities · Updated September 2026
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 63 10.4 | 70 10.1 |
| Family | Claude Sonnet | GPT-5.6 |
| Status | Current | Current |
| Release Date | Jun 2026 | Jul 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 | $12.00/M tokens |
| Pricing Notes | Claude API standard pricing is $2 input and $10 output per million tokens. Cache reads are $0.20, 5-minute cache writes $2.50, and 1-hour cache writes $4 per million tokens. Batch API input/output receives a 50% discount. Current official documentation lists these rates without the previously recorded August 31 introductory expiry; provider-specific rates may differ. | OpenAI pricing page lists $2.50 input and $15 output per 1M tokens, with GPT-5.6 cache-write and cache-read pricing. |
| Capabilities | textvisionreasoningcodingtool-useextended-thinkingagents | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Training Cutoff | — | Feb 16, 2026 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-sonnet-5 | gpt-5.6-terra |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 53artificial-analysis | 55artificial-analysis |
| Artificial Analysis Intelligence Index v4.3 | 38https://artificialanalysis.ai/models/claude-sonnet-5 | 42.2515artificial-analysis |
| GPQA Diamond | 91.1111artificial-analysis | 92.5253artificial-analysis |
| SciCode | 54.2824artificial-analysis | 54.9769artificial-analysis |
| Terminal-Bench 2.1 | 80.5243artificial-analysis | 88.015artificial-analysis |
| Artificial Analysis Coding Agent Index | — | 77.4artificial-analysis |
| View Claude Sonnet 5 | View GPT-5.6 Terra | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Sonnet 5Cheapest | $2.00 | $5.00 | $7.00 | — |
| GPT-5.6 Terra | $2.00 | $6.00 | $8.00 | +14% |
Anthropic
Claude Sonnet 5
Claude Sonnet 5 is Anthropic next-generation Sonnet model and a drop-in upgrade from Sonnet 4.6. Anthropic docs state that adaptive thinking is on by default, manual extended thinking is removed, sampling parameter overrides return errors, and the model supports a 1M token context window with 128K max output.
OpenAI
GPT-5.6 Terra
GPT-5.6 Terra is OpenAI balanced GPT-5.6 model for teams that need strong reasoning and agentic performance at lower cost than Sol. OpenAI model docs list a 1.05M token context window, 128K max output, and support for functions, web search, file search, and computer use.
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