LLM Comparison
Claude Opus 5 vs GPT-5.6 Terra
Side-by-side specs, pricing & capabilities · Updated August 2026
Price vs Intelligence
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2/6 modelsSame tier:
| Organization | ||
| OpenTools Score | 97 6.4 | 59 6.8 |
| Family | Claude Opus | GPT-5.6 |
| Status | Current | Current |
| Release Date | Jul 2026 | Jul 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $5.00/M tokens | $2.50/M tokens |
| Output Price | $25.00/M tokens | $15.00/M tokens |
| Pricing Notes | Claude Opus 5 is priced at $5 per million input tokens and $25 per million output tokens; fast mode is priced separately at Fable-level rates. | 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-useagentslong-context | textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-opus-5 | gpt-5.6-terra |
| Benchmarks | ||
| Artificial Analysis Intelligence Index | 61artificial-analysis | 55artificial-analysis |
| Artificial Analysis Coding Agent Index | — | 77.4artificial-analysis |
| View Claude Opus 5 | View GPT-5.6 Terra | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| GPT-5.6 TerraCheapest | $2.50 | $7.50 | $10.00 | — |
| Claude Opus 5 | $5.00 | $12.50 | $17.50 | +75% |
Anthropic
Claude Opus 5
Claude Opus 5 is Anthropic's Opus-class model for complex agentic coding and enterprise work. Official Claude docs list the claude-opus-5 API ID, 1M token context window, 128k max output, adaptive thinking, and $5 input / $25 output pricing per million tokens.
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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