Claude Opus 4.8vsOpus 4.5
Across 3 shared benchmarks, Claude Opus 4.8 leads overall: Claude Opus 4.8 wins 3, Opus 4.5 wins 0, with 0 ties and an average score difference of +9.67.
Claude Opus 4.8
Anthropic · 2026-05-28 · Reasoning model
Opus 4.5
Anthropic · 2025-11-25 · Reasoning model
Claude Opus 4.83 wins(100%)(0%)0 winsOpus 4.5
Benchmark scores
Grouped by capability, sorted by largest gap within each. 3 shared benchmarks.
General Knowledge
Claude Opus 4.8 2/2| Benchmark | Claude Opus 4.8 | Opus 4.5 | Diff |
|---|---|---|---|
| HLE | 57.905 / 157Extended (with tools) | 43.2039 / 157Extended (with tools) | +14.70 |
| GPQA Diamond | 93.606 / 178Thinking High (No Tools) | 8738 / 178Extended (no tools) | +6.60 |
Coding and Software Engineer
Claude Opus 4.8 1/1| Benchmark | Claude Opus 4.8 | Opus 4.5 | Diff |
|---|---|---|---|
| SWE-bench Verified | 88.604 / 108Extended (with tools) | 80.908 / 108Extended (with tools) | +7.70 |
Specs
| Field | Claude Opus 4.8 | Opus 4.5 |
|---|---|---|
| Publisher | Anthropic | Anthropic |
| Release date | 2026-05-28 | 2025-11-25 |
| Model type | Reasoning model | Reasoning model |
| Architecture | Dense | Dense |
| Parameters | Not available | Not available |
| Context length | 1M | 200K |
| Max output | 125K | 64K |
API pricing
Prices use DataLearner records when available; missing fields are not inferred.
| Item | Claude Opus 4.8 | Opus 4.5 |
|---|---|---|
| Text input | $5 / 1M tokens | $5 / 1M tokens |
| Text output | $25 / 1M tokens | $25 / 1M tokens |
| Cache read | $0.5 / 1M tokens | $0.5 / 1M tokens |
| Cache write | $6.25 / 1M tokens | $6.25 / 1M tokens |
Summary
- Claude Opus 4.8leads in:General Knowledge (2/2), Coding and Software Engineer (1/1)
On average across the 3 shared benchmarks, Claude Opus 4.8 scores 9.67 higher.
Largest single-benchmark gap: HLE — Claude Opus 4.8 57.90 vs Opus 4.5 43.20 (+14.70).
Page generated from structured model, pricing and benchmark records. No real-time LLM is used to write the prose.