Compare / head-to-head
Claude Sonnet 4.5vsClaude Sonnet 5
Claude Sonnet 5 leads 8 of 8 shared benchmarks. Claude Sonnet 5 is 1.5x cheaper per token. Claude Sonnet 5 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 8
Claude Sonnet 5 leads
Cheaper per token
Claude Sonnet 5
1.5x cheaper, input + output
Larger context
Claude Sonnet 5
1M tokens
Provider uptime (30d)
100%
Anthropic
Claude Sonnet 4.5
Anthropic · released 2025-09-29
textvision
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
Quality
Benchmark matrix
8 shared · 12 only Claude Sonnet 4.5 · 0 only Claude Sonnet 5| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 8 | ||||
| SWE-bench Verified | 77.2% ↗ | 85.2% ↗ | -8 pt | Claude Sonnet 5 |
| GPQA Diamond | 83.4% ↗ | 90.5% ↗epoch | -7.1 pt | Claude Sonnet 5 |
| Humanity's Last Exam (no tools) | 17.7% ↗ | 43.2% ↗ | -25.5 pt | Claude Sonnet 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | 29.3% ↗epoch | -26.9 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 23.9% ↗epoch | 65.6% ↗epoch | -41.7 pt | Claude Sonnet 5 |
| Humanity's Last Exam (with tools) | 33.6% ↗ | 57.4% ↗ | -23.8 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 77.8% ↗epoch | 94.7% ↗epoch | -16.9 pt | Claude Sonnet 5 |
| SimpleQA Verified | 30.7% ↗epoch | 33.7% ↗epoch | -3 pt | Claude Sonnet 5 |
| Only Claude Sonnet 4.5 reports · 12 | ||||
| AIME 2025 | 84.2% ↗matharena ⚠ | not reported | — | — |
| ARC-AGI-2 (Verified) | 13.6% ↗ | not reported | — | — |
| GDPval-AA | 1276 ↗ | not reported | — | — |
| MCP Atlas | 43.8% ↗ | not reported | — | — |
| MMMLU | 89.5% ↗ | not reported | — | — |
| MMMU-Pro (no tools) | 63.4% ↗ | not reported | — | — |
| MMMU-Pro (with tools) | 68.9% ↗ | not reported | — | — |
| OSWorld-Verified | 61.4% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 71.3% ↗epoch | not reported | — | — |
| Tau2-bench Retail | 86.2% ↗ | not reported | — | — |
| Tau2-bench Telecom | 98% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 51% ↗ | not reported | — | — |
| Only Claude Sonnet 5 reports · 0 | ||||
| Claude Sonnet 5 reports nothing Claude Sonnet 4.5 does not. | ||||
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 Sonnet 4.5 minus Claude Sonnet 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 Sonnet 4.5 | Claude Sonnet 5 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 1M tokens | Claude Sonnet 5 |
| Max output | 64K tokens | 128K tokens | Claude Sonnet 5 |
| Input price / 1M | $3 ↗ | $2 ↗ | Claude Sonnet 5 |
| Output price / 1M | $15 ↗ | $10 ↗ | Claude Sonnet 5 |
| Cached input / 1M | $0.3 ↗ | $0.2 ↗ | Claude Sonnet 5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $18 | $12 | Claude Sonnet 5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-09-29 | 2026-06-30 | — |
| Cited benchmark scores | 21 | 8 | — |
Reliability
Anthropic status
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 4.5 and Claude Sonnet 5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.