Anthropic
Claude Sonnet 5
Claude Sonnet 5 is a Anthropic model with 1M context, $2 in / $10 out per million tokens, last verified October 1, 2026. Open weights: no. Status: Superseded since September 28, 2026; the current pick is Claude Sonnet 5.5. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.
Claude Sonnet 5 is Anthropic's previous Sonnet generation for high-volume agentic work at $2/$10.
Recorded profile verification October 1, 2026Individual provider fields may change
| Specification | Claude Sonnet 5 |
|---|---|
| Provider | Anthropic |
| Tier | Balanced |
| Context window | 1M |
| Max output | 128K |
| Input / 1M tokens | $2 |
| Output / 1M tokens | $10 |
| Weights | Closed |
| Parameters | Not verifiedUnverified |
| Reasoning levels | low, medium, high, xhigh, max |
| Modalities | text, image |
| API model id | claude-sonnet-5 |
| Released | June 30, 2026 |
Pricing tiers: Standard $2/$10 per MTok with no long-context surcharge. Cache reads $0.20; 5-minute writes $2.50 and 1-hour writes $4. Batch $1/$5. US-only inference adds 10% where supported. Batch supports 300K output with output-300k-2026-03-24; standard stays 128K. Knowledge cutoff Jan 2026; retirement not sooner than June 30, 2027.
Publisher evidence
Published benchmark results
Each result keeps its source date visible. Dates refer to source publication or capture unless the source explicitly states when it measured the result. A missing benchmark is not treated as a zero.
| Benchmark | Score | Source date | Source |
|---|---|---|---|
| Terminal-Bench 2.1mini-SWE-agent; effort and experiment date not specified in the summary tableCross-model comparability not verified | 80.4% | 2026-06-30 | Anthropic Claude Sonnet 5 system card, sections 8.1 and 8.3 (vendor-reported; mini-SWE-agent harness) · View source |
| Humanity's Last Exam | 57.4% | 2026-06-30 | Anthropic announcement (vendor, with tools) · View source |
| LiveBench | 76% | 2026-09-05 | LiveBench official leaderboard (benchmark-owned), xhigh effort · View source |
Best for
- Everyday generation
- High-volume agents
- Cost-sensitive work
Watch out
History
Claude Sonnet 5 timeline
Release and status events for this model that passed two-source verification — dated, sourced, and linked.
- Claude Sonnet 5ReleaseJune 30, 2026Anthropic announcement
Source receipts
Catalog figures for this model were checked against the following sources.
- Claude model overview — whole-profile source check October 1 (accessed 2026-10-01)
- Claude current API pricing, caching and inference geography (accessed 2026-10-01)
- Anthropic — Claude Sonnet 5 (accessed 2026-08-29)
- Anthropic news — Claude Sonnet 5 (accessed 2026-08-29)
- Current model documentation (accessed 2026-10-01)
- Anthropic selectable effort levels (separate from adaptive thinking mode) (accessed 2026-10-01)
Common questions
Claude Sonnet 5
Answered from the verified figures on this page rather than general guidance.