Claude Sonnet 5 Is Now Available

Anthropic released Claude Sonnet 5 today. It is now the flagship Sonnet model in AI Data Stream and the best balance of speed and capability. Sonnet 4.6 remains available as the previous generation, so you can compare the two on your own analytics before switching.

Pricing

On the standard API we use, Sonnet 5 is priced the same as Sonnet 4.6:

• Input: $3 per million tokens
• Output: $15 per million tokens

Anthropic is also offering introductory pricing of $2 / $10 per million tokens through 31 August 2026. Because the standard price is unchanged from Sonnet 4.6, moving to Sonnet 5 is a straight upgrade for most workloads.

What’s New

Anthropic reports gains across coding, agentic, and tool-use tasks, with stronger long-horizon reasoning than Sonnet 4.6. See Anthropic’s announcement for the full details.

Sonnet 5 also updates how it reasons: it uses adaptive thinking to decide on its own when to reason before answering, so there is nothing extra to configure.

Sonnet 4.6 Stays Available

Unlike some past updates, we have not retired the previous model. Sonnet 4.6 is still in the model picker, labelled as the previous generation, so you can run both side by side and pick the one that works best for your data. Sonnet 5 is the new default for new providers.

Effort Levels

In AI Data Stream, Sonnet 5 offers the low, medium, and high effort levels, the same as Sonnet 4.6. Higher effort trades speed for deeper reasoning — pick whichever suits the task. (The xhigh and max levels remain exclusive to Opus.)

The Full Claude Lineup

• Claude Sonnet 5 — New flagship, best balance of speed and capability
• Claude Sonnet 4.6 — Previous generation
• Claude Opus 4.8 — Most intelligent, for the hardest tasks
• Claude Opus 4.7 — Previous-generation Opus
• Claude Haiku 4.5 — Fastest, great for quick queries

Switching Models

1. Go to Settings > AI Providers
2. Click your Anthropic provider
3. Select your preferred model from the dropdown
4. Save

Or select it from the model picker when starting a new conversation.

Questions?

If you have any questions, contact us or check our AI providers documentation.