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Model details
Claude Opus 4.8
Claude Opus 4.8 sits within the Opus line as the next iteration after Opus 4.7, released in a tight cadence that suggests Anthropic is continuing to iterate quickly on its most capable tier. Third-party commentators have engaged with the accompanying system card in detail, treating it as a substantial document covering safety, risk, and behavioral evaluation rather than a brief changelog. The model's positioning remains that of a frontier general-purpose system aimed at complex reasoning, long-running tasks, and nuanced instruction following, with the Opus designation signaling Anthropic's top-of-line offering for demanding workloads.
What stands out from the available commentary is the breadth of safety and risk evaluation accompanying this release. The system card sections visible in third-party discussions span RSP evaluations, alignment risk trajectory, cyber risk, agentic safety including prompt injection, harmful request handling, bias, and what the commentators frame as new risk pathways. For practitioners, the model is best understood as a tool for sophisticated agentic and analytical tasks where reliability over long contexts matters, paired with a safety posture that Anthropic is documenting and stress-testing more thoroughly than in prior Opus releases.
Quick Info
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- Neon
- Model key
- claude-opus-4-8
- Release date
- May 28, 2026
- Last updated
- May 28, 2026
- Knowledge cutoff
- 2026-01
- Input modalities
- Output modalities
- Capabilities
Cost
- Input token cost
- $5.00
- Output token cost
- $25.00
Limits
- Output tokens
- 128,000 tokens
- Context window
- 1,000,000 tokens
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