Claude 4.6 Sonnet
Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context.
Specifications
- Context window
- 1,000,000 tokens
- Modality
- text, vision
- License
- proprietary
- Family
- Claude
- Release date
- 2026-02-17
Provider status
Timeline
Released
Initial public availability.
Pricing changes, lineage updates, and new benchmark results appear here as they happen. See the releases feed for the latest vendor activity.
API pricing
| Tier | Input / 1M tokens | Output / 1M tokens | Cache read | As of |
|---|---|---|---|---|
| standard | $3.00 | $15.00 | $0.30 | 2026-02-17 · source ↗ |
Looking for consumer subscriptions? See Anthropic's plans →
Benchmarks
Model Index →| Benchmark | Score | Setting | Measured | Source |
|---|---|---|---|---|
| MMLU-Pro general knowledge | 85.4% | 5-shot CoT | 2026-02-17 | source ↗ |
| GPQA Diamond reasoning | 85.8% | 0-shot CoT | 2026-02-17 | source ↗ |
| HumanEval coding | 95.9% | pass@1 | 2026-02-17 | source ↗ |
| Aider Polyglot coding | 83.6% | edit + test | 2026-02-25 | source ↗ |
| AIME 2025 math | 87.4% | CoT extended | 2026-02-17 | source ↗ |
| LiveCodeBench coding | 73.8% | pass@1, post-cutoff | 2026-02-28 | source ↗ |
Want to see how Claude 4.6 Sonnet ranks across these? Open the Model Index leaderboard →
Infrastructure context
All intelligence →Compute, silicon, and capex events that shape Claude 4.6 Sonnet's economics.
- Capex
Amazon's $8B Anthropic investment locks in Trainium as primary training chip
Amazon committed an additional $4B to Anthropic in November 2024 on top of an earlier $4B — total $8B — with the condition that Anthropic adopt AWS Trainium2 as the primary training chip for future Claude models. The deal underwrites Project Rainier and makes Anthropic the anchor tenant for AWS's custom silicon roadmap.
Capex: $8B - Compute cluster
Anthropic's Project Rainier: 400k Trainium2 chips across AWS multi-region
Anthropic's primary training cluster — codenamed Project Rainier — runs on a multi-region Trainium2 fleet AWS built specifically for them. By end of 2025 the configuration was disclosed at roughly 400,000 Trainium2 chips spanning sites in Indiana, Wyoming, and Mississippi. Trainium2's economics are central to Anthropic's ability to sell Sonnet at ~40% the price of equivalent-tier rivals.
Accelerators: 400k · Trainium2Location: St Joseph County, IN + Wyoming + Mississippi - Partnership
Anthropic adds up to 1M TPU v7 Ironwood chips via Google Cloud
Anthropic's November 2025 deal with Google Cloud expands its TPU footprint to up to 1M Ironwood (TPU v7) chips, supplementing the Trainium2 fleet on AWS. This makes Anthropic the rare frontier lab running heterogeneous custom silicon across two clouds. Deal value reportedly tens of billions over multiple years.
Accelerators: 1M · TPU v7 Ironwood
Compare Claude 4.6 Sonnet with…
Agents built on Claude 4.6 Sonnet
Anthropic's CLI coding agent. Top of the SWE-bench Verified leaderboard at 80.8% on Opus 4.6. Lives in the terminal — reads files, executes commands, navigates repos, applies multi-file edits autonomously.
Anthropic's screen-control capability — Claude clicks, types, and scrolls through any GUI app via screenshots and keyboard/mouse primitives.
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