← Claude Opus 4.8 · API · High effort (default)
Evidenceacceptedthird_party_leaderboard
SWE-bench Verified
Vals.ai SWE-bench Verified (mini-swe-agent) — Claude Opus 4.8
ev_2026_07_opus48_swe_vals
Result
88.6%
Confidence A
- Tested
- 2026-07-09
- Runs
- 1
Configuration
How it was measured
- Exact model
- claude-opus-4-8
- Reasoning
- high
- Agent harness
- mini-swe-agent
- Tool access
- bash only
- Prompting
- Vals default; max tokens raised
PRIMARY STR — independent Vals mini-swe-agent board.
Caveats
Known limitations
- mini-swe-agent minimal harness; richer agents can score higher.
- High/max effort — not bare chat.
Weighting
Evidence weight factors
The engine weights each evidence row by these factors (0–1) when fusing scores — higher is more trusted.
relevance0.95
quality0.85
recency1.00
health0.80
comparability0.90
reliability0.85
Benchmark
SWE-bench Verified
Human-filtered 500-instance subset of SWE-bench evaluating whether models can resolve real GitHub issues in existing repositories under a controlled agent harness.
Benchmark source →