AI Rankings

Anthropic

Claude Opus 5

Anthropic's previous-generation Opus model (July 2026), succeeded by Opus 5.5 in September 2026, with adaptive reasoning effort levels.

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Our editorial assessment, based on the public sources listed below. Last reviewed .

Overall rank
#8
Tier
S
Score
88.0
Main category
Overall

Strengths

  • Placed in the upper group of the Artificial Analysis Intelligence Index v4.1, which evaluated 175 models (Aug 2026)
  • Adaptive reasoning with selectable effort levels from high through max
  • 1M-token context window with up to 128K output tokens

Considerations

  • Costs more per token than its successor Opus 5.5 ($4/$20 per 1M), which Anthropic reports matches or exceeds it
  • Now a legacy model; Anthropic recommends migrating to Opus 5.5

Price

API $5 input / $25 output per 1M tokens; listed as a legacy model in Claude plans

Shown for reference — price is not part of the score.

Score breakdown

Performance
90.0
55% of score
Reputation
91.0
35% of score
Recency
66.0
10% of score

The overall score combines these sub-scores using the weights shown. How we score →

Verification status

Each field carries its own re-verification date. Amber means older than 90 days — treat those figures as stale until re-checked.

Pricing
Benchmark
Reputation
Feature list

Checked against the sources listed below.

Sources

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