Claude Opus 4.8 (batch)

Claude Opus 4.8 in batch mode is Anthropic's Opus-tier model optimized for asynchronous processing, with a 1 million token context window.

Strengths

Handles long-horizon agentic tasks, knowledge-intensive work, and autonomous decision-making with strong reasoning across extended contexts.

Best for

Asynchronous workloads where latency is not critical, including complex multi-step reasoning, long-context analysis, and autonomous agent systems.

Limitations

Batch processing has higher latency than real-time inference; for reasoning tasks requiring the absolute highest capability, Claude Fable 5 and Claude Fable 5.1 are newer Mythos-tier alternatives.