Model reference
Claude Opus 4.8 is Anthropic's latest Opus model, built for complex coding, agentic workflows, professional work, and high-stakes reasoning tasks.
API ID
claude-opus-4-8Latest version
Claude Opus 4.8
Release date
May 28, 2026
Context window
1M tokens
Input price
$5 / 1M input tokens
Output price
$25 / 1M output tokens
Last updated
May 28, 2026
Best for
Test Claude Opus 4.8 when the work is complex enough to justify a premium model: multi-file coding, agentic workflows, code review, refactoring, and professional reasoning where reliability matters more than raw speed.
Regular input
$5 / 1M input tokens
Regular output
$25 / 1M output tokens
Fast mode is listed separately at $10 / 1M input tokens and $50 / 1M output tokens. Check official docs before using pricing in customer-facing calculators.
01
Official notes describe stronger coding performance, sharper judgment, and more reliable work in larger codebases.
Developers can use Opus 4.8 for code review, refactoring, migration planning, and multi-file implementation checks.
Review this codebase for hidden bugs, architectural risks, security issues, test coverage gaps, and migration risks. Return critical issues first.
02
Early testers report cleaner tool calls and fewer steps to finish the same multi-step task.
Agent builders care less about one impressive answer and more about consistent execution over long-running work.
Plan a five-step agent workflow for this repository, list required tools, define success checks, and stop before editing any files.
03
Anthropic highlights better uncertainty signaling, stronger self-review, and less unsupported confidence when evidence is thin.
For production work, a model that flags weak assumptions is easier to supervise than one that silently guesses.
Audit this proposal. Separate confirmed facts, assumptions, missing evidence, and risks that should block launch.
You should test Claude Opus 4.8 if your workflow depends on complex coding, multi-step agentic tasks, code review, refactoring, or professional reasoning tasks where reliability matters more than raw speed.
As of May 28, 2026, Anthropic lists Claude Opus 4.8 as the newest Opus release. The API model ID is claude-opus-4-8.
Anthropic lists regular usage at $5 per million input tokens and $25 per million output tokens, the same price as Opus 4.7. Fast mode is listed separately at $10 / $50 per million tokens.
You should test it if your workflow depends on complex coding, multi-step agents, code review, refactoring, or professional reasoning where reliability matters more than raw speed.
No. Latest Opus is an independent, unofficial guide and is not affiliated with Anthropic. Always verify production decisions against official Anthropic documentation.
Anthropic says Opus 4.8 is available through the Claude API, Claude.ai, Claude Code, and major cloud provider options for eligible plans.