Claude Opus 4.8 (Adaptive Reasoning)
FrontierClosed weightsTextAdaptive reasoning
Claude 4.5–4.8 family model by Anthropic.
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 uses adaptive reasoning (decides per-question how much to think).
Also runs at: max effort
Effort controls how long the model thinks before answering — higher effort usually means better answers on hard problems, at the cost of speed and money. Same model underneath, so they share this page.
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 4.5 (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 Sonnet 4.6 (Adaptive Reasoning)
- Claude Sonnet 4.6 (Non-reasoning)