# Claude Sonnet 5

> Claude Sonnet 5 is available on Artifio.ai — a unified AI workspace with a single pay-as-you-go wallet.

- Canonical page: https://artifio.ai/models/claude-sonnet-5
- Run it: https://artifio.ai/create/claude-sonnet-5
- Modality: prompt to text
- Model brand: Anthropic
- Pricing: from about $0.050 per generation (exact cost shown in the workspace before you confirm; varies with selected options)
- Typical generation time: ~20s (catalogue estimate)
- Full pricing table: https://artifio.ai/pricing/models

## About Claude Sonnet 5

Claude Sonnet 5 is Anthropic's mid-tier language model, released on June 30, 2026 as the successor to Claude Sonnet 4.6. Anthropic built it around agent work: the model plans, uses tools like browsers and terminals, and runs autonomously at a level that a few months earlier required the larger Opus models. It became the default model for Free and Pro plans on claude.ai at launch.

What sets this version apart is how close it gets to the flagship. On Anthropic's agentic coding benchmark it scored 63.2 percent, against 69.2 percent for Opus 4.8 and 58.1 percent for Sonnet 4.6, and on some knowledge-work tasks it edges past Opus 4.8. Artifio runs it alongside 100-plus other models in one workspace, billed per generation rather than per subscription.

## Features

- Text generation and reasoning model with image input, aimed at agentic tool use.
- 1M-token context window with a maximum output of 128k tokens.
- Adaptive thinking mode, where the model decides per turn whether extended reasoning is needed.
- Scored 63.2 percent on Anthropic's agentic coding benchmark at release, up from 58.1 percent for Sonnet 4.6.
- Updated tokenizer; the same text produces roughly 1.0 to 1.35 times the tokens of earlier Sonnet models.
- Training data through January 2026.

## What people use it for

- Running autonomous agents that browse, operate terminals, and chain tools across long sessions.
- Software development tasks that need near-flagship coding skill at a lower cost tier.
- Knowledge work such as research summaries and report drafting, where it slightly outperformed Opus 4.8 in Anthropic's testing.
- High-volume text pipelines where per-request cost matters more than peak accuracy.

## Reported strengths

- Completes multi-step tasks end to end; early testers noted it finishes jobs where Sonnet 4.6 stopped halfway.
- Checks its own output without being told to, according to launch coverage.
- Lower rates of hallucination, sycophancy, and cooperation with misuse than Sonnet 4.6.
- Better at refusing malicious requests and resisting prompt-injection hijacks than its predecessor.

## Reported limitations

- Trails Opus 4.8 on the hardest agentic coding work, 63.2 percent versus 69.2 percent on Anthropic's benchmark.
- Anthropic still points users to the Opus tier when accuracy on complex judgment calls is the priority.
- Cybersecurity capability is deliberately constrained; Anthropic reports it cannot develop working software exploits, and cyber safeguards are enabled by default.
- The new tokenizer inflates token counts relative to earlier Sonnets, so long prompts consume context faster.

## Sources

1. Introducing Claude Sonnet 5 (Anthropic): https://www.anthropic.com/news/claude-sonnet-5
2. Anthropic launches Claude Sonnet 5 as a cheaper way to run agents (TechCrunch): https://techcrunch.com/2026/06/30/anthropic-launches-claude-sonnet-5-as-a-cheaper-way-to-run-agents/
3. Models overview - Claude Platform Docs (Anthropic): https://platform.claude.com/docs/en/about-claude/models/overview

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