Claude Opus 4.8

Flagship

Claude Opus 4.8 is Anthropic's flagship as of May 28, 2026, arriving just six weeks after Opus 4.7. Anthropic describes it as a more effective collaborator with sharper judgement, more honesty about its own progress, and the ability to work independently for longer. Agentic coding climbs from 64.3% to 69.2% and knowledge work from 1753 to 1890 on Anthropic's own measures, while API pricing holds at $15 input and $75 output per million tokens. The new fast mode is roughly 2.5x quicker and about three times cheaper than before. It keeps the 1 million token context window and adds Dynamic Workflows for large-scale parallel subagent tasks.

Input Price

$5.00

per 1M tokens

Output Price

$25.00

per 1M tokens

Context Window

tokens

Released

2026-05

API access

Capabilities

textvisiontool-usecode

Key Strengths

✓1M token context window
✓Priced at $5/$25 per 1M tokens, down from the $15/$75 Opus 4.7 era
✓Agentic coding up to 69.2%
✓Fast mode 2.5x faster and 3x cheaper
✓Dynamic Workflows for parallel subagents

Best For

▸Whole-repository refactors
▸Long-running asynchronous agent workflows
▸Multi-document research synthesis
▸Extended codebase debugging

Benchmark Scores

Benchmark	Score	Description
SWE-bench	88.6	Real-world software engineering tasks from GitHub issues (SWE-bench Verified)
GPQA Diamond	93.6	Graduate-level science questions verified by domain experts

Scores sourced from public benchmark datasets. See full benchmark leaderboard for all models.