Claude Opus 4.8 Released: Faster, Cheaper Fast Mode, Dynamic Workflows, and Honesty Improvements

Anthropic released Claude Opus 4.8 today, upgrading Opus 4.7 with benchmark improvements across coding, agentic skills, reasoning, and knowledge work. The new version is available at the same price as the previous model.

Key Features

• Effort control on claude.ai — users can now set how much effort Claude puts into a task.
• Dynamic workflows in Claude Code — lets the model tackle very large-scale problems.
• Fast mode runs at 2.5× speed and is now three times cheaper than fast mode for previous models.

Benchmark Highlights

According to the announcement, Claude Opus 4.8 is the only model to complete every case end-to-end on Anthropic's Super-Agent benchmark, beating prior Opus models and GPT-5.5 at parity on cost. On Online-Mind2Web (computer-use and browser agent tasks), it scored 84% — a meaningful jump over both Opus 4.7 and GPT-5.5. On CursorBench, it exceeds prior Opus models across every effort level.

On the Legal Agent Benchmark, Opus 4.8 is the first model to break 10% overall on the all-pass standard. Early testers also reported improvements in tool-calling efficiency (fewer steps for same intelligence), citation precision, and token efficiency on retrieval workflows.

Honesty Training

Opus 4.8 introduces explicit honesty improvements — the model is trained to avoid making unsupported claims and to flag issues with inputs/outputs proactively. This translated into higher-quality analysis and better signal-to-noise ratio in testers' evaluations.

Pricing

Opus 4.8 is available at the same price as Opus 4.7. Fast mode pricing is 3× cheaper than previous fast mode pricing. Multimodal token cost is 61% cheaper than Opus 4.7 for Genie (Databricks' AI agent).