LLM Comparison
Claude Sonnet 5 vs GPT-5.6 Luna
Side-by-side specs, pricing & capabilities · Updated August 2026
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 55 9.2 | 36 10.3 |
| 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 | $1.00/M tokens |
| Output Price | $10.00/M tokens | $6.00/M tokens |
| Pricing Notes | Introductory pricing is $2 input and $10 output per 1M tokens through August 31, 2026; standard pricing becomes $3/$15 afterward. | OpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing. |
| Capabilities | textvisionreasoningcodingtool-useextended-thinkingagents | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-sonnet-5 | gpt-5.6-luna |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 53artificial-analysis | 51artificial-analysis |
| Artificial Analysis Coding Agent Index | — | 74.6artificial-analysis |
| View Claude Sonnet 5 | View GPT-5.6 Luna | |
Cost Calculator
Enter your expected monthly token usage to compare costs.
| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 LunaCheapest | $1.00 | $3.00 | $4.00 | — |
| Claude Sonnet 5 | $2.00 | $5.00 | $7.00 | +75% |
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 Luna
GPT-5.6 Luna is OpenAI lower-cost GPT-5.6 model for high-volume reasoning, coding, and agentic workloads. OpenAI model docs list the same 1.05M token context window, 128K max output, and major tool support as the larger GPT-5.6 variants.
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