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- May 22, 202595% CONFIDENCEfrom anthropic.com
Claude Sonnet 4 Released
- Anthropic introduced Claude Opus 4 and Claude Sonnet 4 on 22 May 2025 at its first developer conference; Sonnet 4 "is a significant upgrade to Claude Sonnet 3.7, delivering superior coding and reasoning while responding more precisely to your instructions"[3][4]
- Sonnet 4 came to free users as well as the Pro, Max, Team and Enterprise plans, while Opus 4 was for paying users only; both launched on the API, Amazon Bedrock and Google Cloud's Vertex AI[3][4]
- GitHub said it "soars in agentic scenarios" and would make it the model powering the new coding agent in GitHub Copilot; GitHub put it on every paid Copilot plan the same day, with Opus 4 limited to Enterprise and Pro+[3][5]
- Anthropic released Sonnet 4 under the ASL-2 Standard, as it had Sonnet 3.7, while Opus 4 went out under the stricter ASL-3 Standard[1]
- The launch also made Claude Code generally available, with VS Code and JetBrains extensions, and added a code execution tool, an MCP connector, a Files API and one-hour prompt caching to the API[3]
Notable features
- Priced at $3 per million input tokens and $15 per million output tokens, unchanged from earlier Sonnet models[3][4]
- A hybrid model with near-instant answers or extended thinking, which can now call tools such as web search mid-thought (beta) and run tools in parallel[3]
- 72.7% on SWE-bench Verified, which Anthropic called state-of-the-art; 70.0% on GPQA Diamond and 85.4% on MMMLU without extended thinking[3]
- 65% less likely than Sonnet 3.7 to take shortcuts or exploit loopholes on agentic tasks prone to them[3]
- Trained on public internet data as of March 2025 plus non-public data from third parties[1]
References 584% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]90%anthropic.com/claude-4-system-cardanthropic.com· Posted Sep 28, 2026· Starts May 22, 2025· 41% of score
The system card is dated only "May 2025", so the day is the launch post's: "Introducing Claude 4, May 22, 2025" - "Today, we're introducing the next generation of Claude models: Claude Opus 4 and Claude Sonnet 4"; TechCrunch[4] reports the launch at Anthropic's[3] developer conference "Thursday" 22 May.
- [2]75%Claude (AI) - Wikipediaen.wikipedia.org· Added Sep 28, 2026· 41% of score
"On May 22, 2025, Anthropic[1][3] released two more models: Claude Sonnet 4 and Claude Opus 4", with a code execution tool, MCP connectors and a Files API for developers; the article's screenshot shows a Claude Sonnet 4 answer.
- [3]95%Introducing Claude 4anthropic.com· Published May 22, 2025· Starts May 22, 2025 ✓· 6% of score
Anthropic's[1] launch post, dated "May 22, 2025": Sonnet 4 "is a significant upgrade to Claude Sonnet 3.7", free users get it, it scores 72.7% on SWE-bench and costs $3/$15, and GitHub[5] will make it the model behind Copilot's new coding agent. The system card that is the source prints only "May 2025", so this row dates the pin.
- [4]85%Anthropic's new Claude 4 AI models can reason over many stepstechcrunch.com· Published May 22, 2025· Starts May 22, 2025· 6% of score
TechCrunch, 2025-05-22: Anthropic[1][3] launched Opus 4 and Sonnet 4 "during its inaugural developer conference Thursday"; free and paying users get Sonnet 4, designed as a "drop-in replacement" for Sonnet 3.7, at $3/$15 per million tokens on the API, Bedrock and Vertex AI.
- [5]85%Anthropic Claude Sonnet 4 and Claude Opus 4 are now in public preview in GitHub Copilotgithub.blog· Published May 22, 2025· Starts May 22, 2025· 6% of score
GitHub's changelog of 22 May 2025: Sonnet 4, "the successor to the developer-loved Claude Sonnet 3.7", comes to all paid Copilot plans in Copilot Chat on github.com, VS Code and GitHub Mobile, and "is also coming to agent mode and the coding agent"; Opus 4 is limited to Copilot Enterprise and Pro+.
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