# Claude Sonnet 4.6

> **TL;DR.** Claude Sonnet 4.

- **Category:** AI / Frontier Models / LLMs
- **Stage:** rising
- **Age:** 135 days
- **Origin date:** 2026-02-17
- **First detected:** 2026-07-02
- **Canonical URL:** https://earlyterms.com/term/claude-sonnet-4-6
- **Sources:** 6 primary URLs

## Definition

Claude Sonnet 4.6 is Anthropic's mid-tier frontier language model, [released February 17, 2026](https://www.anthropic.com/news/claude-sonnet-4-6). It delivers near-Opus performance at Sonnet pricing — $3/$15 per million tokens — with a 1M-token context window (beta) and expanded agentic capabilities for coding, computer use, and long-context reasoning.

The launch drew immediate developer attention: the Hacker News announcement hit 1,346 points and 1,226 comments in 24 hours. Sonnet 4.6 scored 79.6% on SWE-bench Verified — just 1.2 points behind Opus 4.6 — and 72.5% on OSWorld computer-use tasks, matching the prior flagship Anthropic model at 40% of the price. Developers preferred it over Sonnet 4.5 in 70% of head-to-head coding tests.

## Analogy

Think of it as first-class legroom at business-class prices — not because the airline upgraded you, but because the gap quietly closed.

## Why it's emerging now

Anthropic launched Claude Sonnet 4.6 on February 17, 2026 — the first Sonnet to match Opus 4.5 at Sonnet pricing. With a 1M-token context window (beta), 79.6% SWE-bench Verified, and near-parity with Opus 4.6 on computer-use, it became the default on all Claude.ai plans and the de facto production choice at $3/$15 per million tokens.

## Related terms

- *competitor:* Claude Opus 4.6
- *competitor:* Claude Opus 4.7
- *child:* Sonnet 5
- *child:* Claude Fable 5
- *related:* Claude Code
- *related:* Claude Agent SDK
- *related:* Managed Agents
- *related:* Model Context Protocol
- *related:* Context Window
- *parent:* Agent Harness

## Sources

1. [Anthropic — Introducing Claude Sonnet 4.6](https://www.anthropic.com/news/claude-sonnet-4-6)
2. [Hacker News launch discussion (1,346 points, 1,226 comments)](https://news.ycombinator.com/item?id=47050488)
3. [DataCamp — Claude Sonnet 4.6: Features, Access, Tests, and Benchmarks](https://www.datacamp.com/blog/claude-sonnet-4-6)
4. [NxCode — Claude Sonnet 4.6: 79.6% SWE-bench at $3/MTok Complete Guide](https://www.nxcode.io/resources/news/claude-sonnet-4-6-complete-guide-benchmarks-pricing-2026)
5. [Anthropic Platform Docs — Claude models overview (Sonnet 4.6 in legacy tier)](https://platform.claude.com/docs/en/about-claude/models/overview)
6. [OpenRouter — Claude Sonnet 4.6 pricing and marketplace data](https://openrouter.ai/anthropic/claude-sonnet-4.6)

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_Generated by EarlyTerms · https://earlyterms.com/term/claude-sonnet-4-6_