Compare / head-to-head
Claude Opus 4vsClaude Sonnet 4.5
Claude Sonnet 4.5 leads 4 of 4 shared benchmarks. Claude Sonnet 4.5 is 5x cheaper per token. Both offer a 200K-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 4
Claude Sonnet 4.5 leads
Cheaper per token
Claude Sonnet 4.5
5x cheaper, input + output
Larger context
Tie
both 200K tokens
Provider uptime (30d)
100%
Anthropic
Claude Opus 4
Anthropic · released 2025-05-22
textvision
Claude Sonnet 4.5
Anthropic · released 2025-09-29
textvision
Quality
Benchmark matrix
4 shared · 2 only Claude Opus 4 · 16 only Claude Sonnet 4.5| Benchmark | Claude Opus 4 | Claude Sonnet 4.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| SWE-bench Verified | 72.5% ↗ | 77.2% ↗ | -4.7 pt | Claude Sonnet 4.5 |
| GPQA Diamond | 76.3% ↗epoch | 83.4% ↗ | -7.1 pt | Claude Sonnet 4.5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 64.4% ↗epoch | 77.8% ↗epoch | -13.4 pt | Claude Sonnet 4.5 |
| SWE-bench Verified (Epoch AI run) | 70.7% ↗epoch | 71.3% ↗epoch | -0.6 pt | Claude Sonnet 4.5 |
| Only Claude Opus 4 reports · 2 | ||||
| AIME 2024 (no extended thinking) | 33.9% ↗ | not reported | — | — |
| Terminal-bench | 43.2% ↗ | not reported | — | — |
| Only Claude Sonnet 4.5 reports · 16 | ||||
| AIME 2025 | not reported | 84.2% ↗matharena ⚠ | — | — |
| Humanity's Last Exam (no tools) | not reported | 17.7% ↗ | — | — |
| ARC-AGI-2 (Verified) | not reported | 13.6% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 2.4% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 23.9% ↗epoch | — | — |
| GDPval-AA | not reported | 1276 ↗ | — | — |
| Humanity's Last Exam (with tools) | not reported | 33.6% ↗ | — | — |
| MCP Atlas | not reported | 43.8% ↗ | — | — |
| MMMLU | not reported | 89.5% ↗ | — | — |
| MMMU-Pro (no tools) | not reported | 63.4% ↗ | — | — |
| MMMU-Pro (with tools) | not reported | 68.9% ↗ | — | — |
| OSWorld-Verified | not reported | 61.4% ↗ | — | — |
| SimpleQA Verified | not reported | 30.7% ↗epoch | — | — |
| Tau2-bench Retail | not reported | 86.2% ↗ | — | — |
| Tau2-bench Telecom | not reported | 98% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 51% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Opus 4 minus Claude Sonnet 4.5 in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Opus 4 | Claude Sonnet 4.5 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 200K tokens | Tie |
| Max output | 32K tokens | 64K tokens | Claude Sonnet 4.5 |
| Input price / 1M | $15 ↗ | $3 ↗ | Claude Sonnet 4.5 |
| Output price / 1M | $75 ↗ | $15 ↗ | Claude Sonnet 4.5 |
| Cached input / 1M | $1.5 ↗ | $0.3 ↗ | Claude Sonnet 4.5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $90 | $18 | Claude Sonnet 4.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-05-22 | 2025-09-29 | — |
| Cited benchmark scores | 6 | 21 | — |
Reliability
Anthropic status
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Claude Sonnet 4.5 vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4 and Claude Sonnet 4.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.