Claude Sonnet 5
The most agentic Sonnet yet — near-Opus coding reliability at Sonnet cost.
- Context window
- 1Mtokens
- Max output
- 128Ktokens
- Input price
- $3/ 1M tokens
- Output price
- $15/ 1M tokens
- Cached input
- $0.30/ 1M tokens
- Modalities
- Text, Image, Pdf
- Knowledge cutoff
- Jan 2026
- Released
- Jun 2026
- Approx. speed
- —
What this model is
Claude Sonnet 5 is Anthropic's newest balanced-tier model and the most agentic Sonnet to date, closing much of the gap to Opus on real coding and terminal/tool-use work while keeping Sonnet pricing. It leads its predecessor decisively and edges Opus 4.8 on Terminal-Bench, sustaining long agent loops reliably — the new default production workhorse for most agentic and coding workloads. It pairs adaptive thinking with a 1M-token context and high-resolution vision. Introductory pricing of $2/$10 per 1M tokens runs through 2026-08-31.
Strengths
- Near-Opus agentic-coding reliability at Sonnet cost
- Best-in-Sonnet terminal and tool-use performance
- 1M-token context with adaptive thinking
- High-resolution vision
- Excellent price-to-capability for production
Trade-offs
- Opus 4.8 and Fable 5 still lead the hardest long-horizon jobs
- 128K output cap
- No audio or video input
- New tokenizer counts ~30% more tokens than Sonnet 4.6
Best for
- Production coding agents and Claude Code workflows
- Terminal and tool-use automation
- High-volume developer workflows
- Everyday long-context work
Not ideal for
- The very hardest autonomous coding (prefer Opus 4.8)
- Ultra-low-cost bulk classification
Capability profile
Normalized 0–100 scores, comparable across the whole catalog.
- Reasoning
- 92
- Coding
- 92
- Math
- 90
- Writing
- 92
- Knowledge
- 91
- Speed
- 70
- Agentic
- 91
- Vision
- 88
- Multilingual
- 90
- Long Context
- 94
How it scores
Public benchmark results, with independent third-party results where available. Bars normalize percentages to 100 and Elo ratings to a 1500 ceiling.