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Anthropic: Claude Sonnet 4.6

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with...

Provider
OpenRouter
Availability
Available
Model ID
anthropic/claude-sonnet-4.6
Snapshot
2026-10-07
Evaluation Verdict

Claude Sonnet 4.6 advances agentic software engineering with 74.5% on SWE-bench Verified and 1420 Coding Elo, combining low-latency code synthesis with deep algorithmic verification.

Anthropic: Claude Sonnet 4.6 Benchmarks & Agentic Accuracy

Verified primary research & developer preference metrics

Primary Sources Verified
SWE-bench Verified
74.5%
ThinkingAnthropic Frontier Card ↗
LiveCodeBench
65.8%
ThinkingLiveCodeBench ↗
LMSYS Coding Elo
1420Elo
Coding ArenaLMSYS Arena ↗
AIME 2024 / 2025
86%
ThinkingAnthropic Frontier Card ↗
Pricing ($ / 1M tokens)
$3/ $15
$0.35 cached readStandard API Pricing

What This Means in Real Software Development

  • Achieves 74.5% SWE-bench Verified, delivering elite multi-file bug fixes across large-scale monorepos.
  • Refined code synthesis avoids hallucinations in rare Go/Rust concurrency primitives and complex database transactions.
  • Fast output speed ensures minimal developer wait time during interactive TUI pairing.
  • Full native support for Swarm DAG task program integration barriers.

Swarm Multi-Agent Topology

Tier 1: Enterprise Lead EngineerRole: Primary / Planner

Best Paired With: Gemini 3.8 Flash as Coder subagents

High-confidence planning eliminates DAG circularities and ensures accurate scope isolation across Coder worktrees.

Git Worktree Isolation Advantage:

Swarm guarantees zero branch pollution by committing Sonnet 4.6 diffs to isolated sibling worktrees.

What Developers & Practitioners Are Saying

Real-world field observations, production strengths, and developer consensus

Field Consensus

"Production-hardened systems engineering model from Anthropic, delivering dependable multi-turn code edits."

Verified Real-World Strengths

  • 74.5% SWE-bench Verified
  • Superb architectural consistency across multi-stage Task Programs
  • Flawless TypeScript, Python, and Go idiom generation

Production Caveats & Gaps

  • Benefits from external verification checks to prevent subtle semantic bugs
Benchmark Reality Check

What the benchmark tests: Evaluates full-stack software development and refactoring accuracy.

Production caveat: Best deployed as a dedicated Coder subagent inside isolated worktrees.

Primary Sources & Methodology Citations

Anthropic: Claude Sonnet 4.6 model overview

Anthropic: Claude Sonnet 4.6 is listed in the public Swarm catalog through OpenRouter. This page summarizes the verified catalog fields used by Swarm without claiming real-time access for every provider account.

Provider
OpenRouter
Family
OpenRouter
Context window
1M tokens
Thinking support
off · low · medium · high · max
Availability status
Available
Catalog ID
openrouter/anthropic/claude-sonnet-4.6
  • File input
  • Image input
  • Text input
  • Text output
  • Reasoning
  • Tools
  • Structured output
  • JSON

Run Anthropic: Claude Sonnet 4.6 in Swarm

Verified CLI workflow & multi-agent architecture

Quickstart Guide →
bash — swarm run
$swarm ctl model set --provider openrouter --model openrouter/anthropic/claude-sonnet-4.6

# Or switch interactively inside the terminal TUI:

>/models

Subagent Role Matrix

Assign Anthropic: Claude Sonnet 4.6 to specialized system roles in ~/.swarm/config.json:

  • Primary / Planner: Orchestrates full task DAGs and multi-stage pipelines.
  • Coder Subagent: Generates code and unit tests inside private Git worktrees.
  • Finder Subagent: Performs read-only code search, symbol discovery, and mapping.
System Agent Roles →Why Swarm Architecture →
← All OpenRouter models

Public catalog snapshot. Catalog availability is not a real-time provider status or an access guarantee.