Compare / head-to-head
Claude Opus 4vsClaude Opus 4.8
Claude Opus 4.8 leads 3 of 3 shared benchmarks. Claude Opus 4.8 is 3x cheaper per token. Claude Opus 4.8 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 3
Claude Opus 4.8 leads
Cheaper per token
Claude Opus 4.8
3x cheaper, input + output
Larger context
Claude Opus 4.8
1M tokens
Provider uptime (30d)
100%
Anthropic
Claude Opus 4
Anthropic · released 2025-05-22
textvision
Claude Opus 4.8
Anthropic · released 2026-05-28
textvision
Quality
Benchmark matrix
3 shared · 3 only Claude Opus 4 · 13 only Claude Opus 4.8| Benchmark | Claude Opus 4 | Claude Opus 4.8 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 3 | ||||
| SWE-bench Verified | 72.5% ↗ | 88.6% ↗ | -16.1 pt | Claude Opus 4.8 |
| GPQA Diamond | 76.3% ↗epoch | 93.6% ↗ | -17.3 pt | Claude Opus 4.8 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 64.4% ↗epoch | 98.3% ↗epoch | -33.9 pt | Claude Opus 4.8 |
| Only Claude Opus 4 reports · 3 | ||||
| AIME 2024 (no extended thinking) | 33.9% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 70.7% ↗epoch | not reported | — | — |
| Terminal-bench | 43.2% ↗ | not reported | — | — |
| Only Claude Opus 4.8 reports · 13 | ||||
| AIME 2026 | not reported | 100% ↗matharena ⚠ | — | — |
| Humanity's Last Exam (no tools) | not reported | 49.8% ↗ | — | — |
| LMArena Elo | not reported | 1452.7 ↗ | — | — |
| BrowseComp | not reported | 84.3% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 56.1% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 80% ↗epoch | — | — |
| Humanity's Last Exam (with tools) | not reported | 57.9% ↗ | — | — |
| OSWorld-Verified | not reported | 83.4% ↗ | — | — |
| SimpleQA Verified | not reported | 53% ↗epoch | — | — |
| SWE-bench Multilingual | not reported | 84.4% ↗ | — | — |
| SWE-bench Multimodal | not reported | 38.4% ↗ | — | — |
| SWE-Bench Pro | not reported | 69.2% ↗ | — | — |
| Terminal-Bench 2.1 | not reported | 74.6% ↗ | — | — |
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 Opus 4.8 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 Opus 4.8 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 1M tokens | Claude Opus 4.8 |
| Max output | 32K tokens | 128K tokens | Claude Opus 4.8 |
| Input price / 1M | $15 ↗ | $5 ↗ | Claude Opus 4.8 |
| Output price / 1M | $75 ↗ | $25 ↗ | Claude Opus 4.8 |
| Cached input / 1M | $1.5 ↗ | $0.5 ↗ | Claude Opus 4.8 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $90 | $30 | Claude Opus 4.8 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-05-22 | 2026-05-28 | — |
| Cited benchmark scores | 6 | 17 | — |
Reliability
Anthropic status
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Claude Opus 4 vs …
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Claude Opus 4.8 vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4 and Claude Opus 4.8 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.