Compare / head-to-head
Claude Opus 4.8vsClaude Sonnet 5
Claude Opus 4.8 leads 8 of 8 shared benchmarks. Claude Sonnet 5 is 2.5x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
8 – 0
Claude Opus 4.8 leads
Cheaper per token
Claude Sonnet 5
2.5x cheaper, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100%
Anthropic
Claude Opus 4.8
Anthropic · released 2026-05-28
textvision
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
Quality
Benchmark matrix
8 shared · 8 only Claude Opus 4.8 · 0 only Claude Sonnet 5| Benchmark | Claude Opus 4.8 | Claude Sonnet 5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 8 | ||||
| SWE-bench Verified | 88.6% ↗ | 85.2% ↗ | +3.4 pt | Claude Opus 4.8 |
| GPQA Diamond | 93.6% ↗ | 90.5% ↗epoch | +3.1 pt | Claude Opus 4.8 |
| Humanity's Last Exam (no tools) | 49.8% ↗ | 43.2% ↗ | +6.6 pt | Claude Opus 4.8 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 56.1% ↗epoch | 29.3% ↗epoch | +26.8 pt | Claude Opus 4.8 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 80% ↗epoch | 65.6% ↗epoch | +14.4 pt | Claude Opus 4.8 |
| Humanity's Last Exam (with tools) | 57.9% ↗ | 57.4% ↗ | +0.5 pt | Claude Opus 4.8 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.3% ↗epoch | 94.7% ↗epoch | +3.6 pt | Claude Opus 4.8 |
| SimpleQA Verified | 53% ↗epoch | 33.7% ↗epoch | +19.3 pt | Claude Opus 4.8 |
| Only Claude Opus 4.8 reports · 8 | ||||
| AIME 2026 | 100% ↗matharena ⚠ | not reported | — | — |
| LMArena Elo | 1452.7 ↗ | not reported | — | — |
| BrowseComp | 84.3% ↗ | not reported | — | — |
| OSWorld-Verified | 83.4% ↗ | not reported | — | — |
| SWE-bench Multilingual | 84.4% ↗ | not reported | — | — |
| SWE-bench Multimodal | 38.4% ↗ | not reported | — | — |
| SWE-Bench Pro | 69.2% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 74.6% ↗ | not reported | — | — |
| Only Claude Sonnet 5 reports · 0 | ||||
| Claude Sonnet 5 reports nothing Claude Opus 4.8 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 Opus 4.8 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 Opus 4.8 | Claude Sonnet 5 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $5 ↗ | $2 ↗ | Claude Sonnet 5 |
| Output price / 1M | $25 ↗ | $10 ↗ | Claude Sonnet 5 |
| Cached input / 1M | $0.5 ↗ | $0.2 ↗ | Claude Sonnet 5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $30 | $12 | Claude Sonnet 5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-05-28 | 2026-06-30 | — |
| Cited benchmark scores | 17 | 8 | — |
Reliability
Anthropic status
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Claude Opus 4.8 vs …
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Claude Sonnet 5 vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4.8 and Claude Sonnet 5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.