Claude Opus 4.5 (Reasoning)
FrontierClosed weightsTextReasoning
Claude 4.5–4.8 family model by Anthropic — reasoning.
About the Claude 4.5–4.8 family
The late-2025 Claude generation (Sonnet 4.5/4.6, Opus 4.5–4.8, Haiku 4.5) — strong coding and agentic ability, with reasoning toggles and, on later versions, adaptive effort control.
All Claude 4.5–4.8 modelsHow this one is configured
This configuration runs in reasoning mode (thinks step-by-step before answering).
Who makes it
AnthropicUnited StatesSafety-focused lab behind the Claude model family.More from Claude 4.5–4.8
- Claude 4.5 Haiku (Non-reasoning)
- Claude 4.5 Haiku (Reasoning)
- Claude 4.5 Sonnet (Non-reasoning)
- Claude 4.5 Sonnet (Reasoning)
- Claude Opus 4.5 (Non-reasoning)
- Claude Opus 4.6 (Adaptive Reasoning)
- Claude Opus 4.6 (Non-reasoning)
- Claude Opus 4.7 (Adaptive Reasoning)
- Claude Opus 4.7 (Non-reasoning)
- Claude Opus 4.8 (Adaptive Reasoning)
- Claude Sonnet 4.6 (Adaptive Reasoning)
- Claude Sonnet 4.6 (Non-reasoning)