Claude Opus 4.8
Overview
Claude Opus 4.8 is Anthropic’s previous-generation frontier model in the Opus tier, built for highly autonomous agents, long-horizon agentic work, and knowledge work. It accepts text and image inputs, offers a 1M-token context window, and supports adaptive thinking by default. On the platform it also serves as the fallback target for frontier Claude models in sensitive scenarios.
Key Features
- Previous Frontier: Opus-tier strong reasoning for complex autonomous tasks
- Adaptive Thinking: Supports adaptive reasoning depth
- Long Context: 1M-token context for long sessions and long-horizon agents
Best Use Cases
- Autonomous Agents: Multi-step, cross-tool long-horizon execution
- Long-Horizon Knowledge Work: Tasks that must stay coherent across long sessions
- Deep Analysis: High-complexity research and decision support
Specifications
| Item | Detail |
|---|---|
| Platform model ID | claude-opus-4-8 |
| Context window | 1,000,000 tokens |
| Input modalities | Text, image |
| Reasoning / thinking | Supported (adaptive thinking) |
| First released (market) | 2026-05-28 |
| Live pricing | See the model marketplace |
Capabilities and Limitations
| Capability | Description |
|---|---|
| Reasoning | Extremely strong. Complex autonomous agents and knowledge work |
| Multimodal | Supports text and image input (no audio/video) |
| Context Window | 1,000,000 tokens |
| Speed | Moderate to slow. Built for high-complexity tasks |
Last updated on