Anthropic Claude Sonnet 5 vs Sonnet 4.6 vs Opus 4.8: Agentic Coding Benchmarks, API Pricing, and Cost-Performance Tradeoffs Compared

Anthropic simply shipped Claude Sonnet 5. They name it its most agentic Sonnet mannequin but. It plans, drives browsers and terminals, and runs autonomously throughout lengthy duties.

Sonnet 5 is the default mannequin for Free and Pro plans as we speak. Max, Team, and Enterprise customers can choose it. It can also be stay in Claude Code and on the Claude Platform.

TL;DR

• Sonnet 5 is Anthropic’s most agentic mid-tier mannequin, closing a lot of the hole to Opus 4.8.
• Beats Sonnet 4.6 on each revealed benchmark: 63.2% SWE-bench Pro, 81.2% OSWorld-Verified, 57.4% HLE.
• Cheaper to run: $2/$10 per MTok intro pricing via Aug 31, then $3/$15; Opus 4.8 is $5/$25.
• Best worth at low/medium effort; at xhigh it could actually value greater than Opus 4.8 for related high quality.
• Safer than 4.6, with intentionally low cyber functionality — Opus stays the choose for accuracy-critical work.

Claude Sonnet 5

Sonnet sits in the midst of Anthropic’s lineup. It is above the cheaper Haiku 4.5 and beneath the flagship Opus 4.8.

Sonnet 5 is an improve to Sonnet 4.6, which launched in February 2026. Anthropic frames this launch round agentic reliability, not one headline benchmark.

In observe, which means longer process chains with out shedding context. It means higher self-correction when a software name fails. It means steadier conduct throughout prolonged classes inside Claude Code or Cowork.

The mannequin exposes effort ranges: low, medium, excessive, and xhigh (additional excessive). Higher effort spends extra tokens on reasoning. That raises each high quality and value.

It is necessary to notice that Sonnet 5 makes use of an up to date tokenizer, the identical one launched with Opus 4.7. The identical textual content can map to roughly 1.0 to 1.35 occasions extra tokens.

Interactive Explainer