token.app › Compare › Claude Sonnet 4.5 vs GPT-5.6 Terra
Claude Sonnet 4.5 vs GPT-5.6 Terra
GPT-5.6 Terra leads on 5 of 5 shared benchmarks. GPT-5.6 Terra is 2.7× cheaper per token on a blended 3:1 basis. GPT-5.6 Terra accepts the larger context window (1.1M).
Head to head
Blended price uses a 3:1 input:output mix
| Claude Sonnet 4.5 | GPT-5.6 Terra | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input $/1M | $3.00 | $1.00 |
| Output $/1M | $15.00 | $6.00 |
| Blended $/1M | $6.00 | $2.25 |
| Context window | 1M | 1.1M |
| Max output | 64K | 128K |
| Released | Sep 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 82.3% | 93.3% |
| FrontierMath T1–3 | 23.9% | 86.0% |
| FrontierMath T4 | 2.4% | 70.7% |
| SimpleQA Verified | 23.6% | 43.1% |
| OTIS Mock AIME | 77.8% | 99.7% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Claude Sonnet 4.5 if…
- No clear advantage on the data we hold.
Choose GPT-5.6 Terra if…
- Costs less per token — $2.25 vs $6.00 blended
- Higher GPQA Diamond (93.3% vs 82.3%)
- Higher FrontierMath T1–3 (86.0% vs 23.9%)
- Higher FrontierMath T4 (70.7% vs 2.4%)
- Higher SimpleQA Verified (43.1% vs 23.6%)
- Larger context window (1.1M)
- Newer model (released Jul 2026)
FAQ
Which is better, Claude Sonnet 4.5 or GPT-5.6 Terra?
Across the 5 benchmarks both models have independently-run scores for, Claude Sonnet 4.5 leads on 0 and GPT-5.6 Terra leads on 5. Benchmarks are one input — price and context window are on this page too.
Is Claude Sonnet 4.5 cheaper than GPT-5.6 Terra?
GPT-5.6 Terra is cheaper: $2.25 versus $6.00 per million tokens blended at 3:1 input:output. Input alone: $3.00 vs $1.00. Output alone: $15.00 vs $6.00.
What context windows do Claude Sonnet 4.5 and GPT-5.6 Terra have?
Claude Sonnet 4.5: 1,000,000 tokens. GPT-5.6 Terra: 1,050,000 tokens.
Who makes Claude Sonnet 4.5 and GPT-5.6 Terra?
Claude Sonnet 4.5 is made by Anthropic. GPT-5.6 Terra is made by OpenAI.
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