What is Claude Opus 5?

Claude Opus 5 is Anthropic’s Opus-tier model for complex agentic coding, knowledge work, and enterprise tasks. Released on July 24, 2026, it is positioned as offering performance close to Claude Fable 5 at half the API price. It is the default model on Claude Max and the strongest model available on Claude Pro.

How much does Claude Opus 5 cost?

Claude Opus 5 costs $5 per million input tokens and $25 per million output tokens, the same price as Opus 4.8 and half the price of Fable 5. Fast Mode costs $10 per million input tokens and $50 per million output tokens and runs at about 2.5 times the default speed.

How does Claude Opus 5 compare to Fable 5?

Claude Opus 5 costs half as much as Fable 5 and performs better on several of Anthropic’s published coding, knowledge-work, computer-use, and business-workflow benchmarks. Fable 5 remains Anthropic’s highest-capability widely available model for demanding, long-running agents and retains an advantage on some reasoning and specialised tasks.

How does Claude Opus 5 compare to Opus 4.8?

Claude Opus 5 has the same API price as Opus 4.8 but delivers substantially higher benchmark performance. Frontier-Bench rises from 21.1% to 43.3%, ARC-AGI 3 increases from 1.5% to 30.2%, and GDPval-AA v2 improves by 268 Elo points. Opus 5 also uses adaptive thinking by default and responds more reliably to higher effort settings.

What is the Claude Opus 5 context window?

Claude Opus 5 has a 1-million-token context window, which is both its default and maximum context length. It supports up to 128,000 output tokens through the synchronous Messages API.

Is Claude Opus 5 available through the API?

Yes. Claude Opus 5 is available to all Claude API customers under the model ID claude-opus-5. It is also available through Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry, and Claude Platform on AWS. Fast Mode is limited to Anthropic’s Claude API and Claude Code usage credits.