Claude Sonnet 5
- Score
- 38.2 · rank 35
- Price
- Freemium
- API
- No
- Weights
- No
WHAT IT DOES
Claude Sonnet 5 is Anthropic's mid-tier model released June 30, 2026, replacing Sonnet 4.6 as the default model on Claude.ai's Free and Pro plans. It plans, uses tools like browsers and terminals, and runs autonomously, with performance approaching Claude Opus 4.8 on reasoning, tool use, coding, and knowledge work at a fraction of the cost. It also checks its own output without being explicitly asked to.
WHY WE PICKED IT
Sonnet 5 is the practical default for most day-to-day work: it closes much of the gap to Opus-tier performance while staying meaningfully cheaper, and Anthropic made it the automatic replacement for Sonnet 4.6 across the free and Pro tiers.
QUICK FACTS
STRENGTHS
- ✓Near-Opus 4.8 performance at a significantly lower price
- ✓Strong autonomous tool use, browsers, terminals, multi-step plans
- ✓Self-checks its own output without being explicitly prompted to
- ✓Default model for Claude.ai Free and Pro, so broadly accessible
- ✓Meaningful gains over Sonnet 4.6 on reasoning, coding, and tool use
LIMITATIONS
- ⚠Still a notch below Opus 4.8 on the most demanding reasoning tasks
- ⚠Output tokens cost 5x input tokens
- ⚠Standard pricing rises after the August 31, 2026 launch-pricing window
- ⚠Newly released, so long-term reliability data is still limited
GETTING STARTED
Access Claude Sonnet 5 via the Claude web or mobile app (it's now the default model on Free and Pro plans) or through the Anthropic API. Pricing is $2/M input and $10/M output tokens. Anthropic first called this an introductory rate due to rise to $3/$15 on September 1, 2026, then made it permanent. Its successor, Claude Sonnet 5.5, launched September 28, 2026 at the same price.
BENCHMARKS
QUICK TIPS
OFFICIAL LINKS
USE CASE EXAMPLES
Autonomous Multi-Step Agent Task
Let Sonnet 5 plan and execute a task using browser and terminal tools.
- Describe the end goal and constraints
- Let Sonnet 5 draft a plan
- Approve or adjust the plan
- Let it execute using tool calls
- Review the self-checked final output
Cost-Efficient Coding Assistant
Use Sonnet 5 as a daily coding assistant instead of a pricier Opus-tier model.
- Connect Sonnet 5 via API or Claude Code
- Describe the coding task
- Review generated changes
- Iterate with follow-up prompts
- Reserve Opus 4.8 only for the hardest subtasks
PRICING
Free tier includes limited features. Paid plans unlock full access, higher usage limits, and commercial usage rights.
FEATURED IN GUIDES
CLAUDE.md In Practice: What Actually Earns A Place In The File
The most-starred CLAUDE.md on GitHub has four rules, not twelve, and the error rates everyone quotes...
Open Models: What They Cannot Do
The benchmark gap has largely closed: open models now score within a point of the closed frontier on...
Hardware For Local AI Models: What The Memory Shortage Changed
Capacity decides whether a model runs. Bandwidth decides how fast it talks, and it is the number mos...
How To Run AI Models Locally: Hardware, Quantisation And Engines
Running a frontier open model locally is a memory problem before it is a speed problem, and a bandwi...
Uncensored AI Models: What Abliteration Actually Does To Them
Abliteration removes a model's ability to refuse by deleting one direction from its activations. It ...
EXPLORE ALTERNATIVES
Compare Claude Sonnet 5 with 5+ similar llms AI tools.
FREQUENTLY ASKED QUESTIONS
Is Claude Sonnet 5 free?
Claude Sonnet 5 offers a free tier with optional paid upgrades.
Does Claude Sonnet 5 have an API?
No, Claude Sonnet 5 does not appear to offer a public API.
What is Claude Sonnet 5 best for?
Claude Sonnet 5 is best for Everyday Agentic Work. Claude Sonnet 5 is Anthropic's mid-tier model released June 30, 2026, replacing Sonnet 4. Sonnet 5 is the practical default for most day-to-day work: it closes much of the gap to Opus-tier performance while staying meaningfully cheaper, and Anthropic made it the automatic replacement for Sonnet 4.6 across the free and Pro tiers.
What platforms does Claude Sonnet 5 support?
Claude Sonnet 5 supports web, api.
Is Claude Sonnet 5 open source?
No, Claude Sonnet 5 is not open source.
How do I get started with Claude Sonnet 5?
Access Claude Sonnet 5 via the Claude web or mobile app (it's now the default model on Free and Pro plans) or through the Anthropic API. Pricing is $2/M input and $10/M output tokens. Anthropic first called this an introductory rate due to rise to $3/$15 on September 1, 2026, then made it permanent....
How do I use Claude Sonnet 5?
Claude Sonnet 5 is a large language model for text generation, analysis, and conversation. Access through the web interface. Enter prompts or questions to get responses. It excels at near-opus 4.8 performance at a significantly lower price.
FEATURED ON CURATEDAI
Work on Claude Sonnet 5? You're hand-reviewed in our directory. Add this badge to your site — it links back to this profile.
