Claude Sonnet 5latest from anthropic
People use it to write code, complete professional tasks, and solve problems with adaptive thinking.
anthropic’s newest large language model, able to hold about 1000k tokens of context (roughly 750k words) in one conversation, working across text and image and file->text. You reach it through an API or through tools built on it. Built for professionals and developers who write code and do professional work. anthropic describes it as: “Sonnet 5 is Anthropic's most capable Sonnet-class model, with frontier performance across coding, agents, and professional work.” source ↗
Our tested score
Battle record
unfought
no battle yet — we don't guess
Forum sentiment (90d)
40%
developer-forum posts: 5 opinions in 93
What people are posting (90 days)
Loudest post this quarter
“[MODEL] Measurable quality regression in Claude generation 5 (Fable 5 / Opus 5 / Sonnet 5): worse nonsense detection, ~2x verbosity, under-disclosed model fallback (Fable 5 → Opus 4.8) — reproducible measurements”
Compare Claude Sonnet 5 against…
GPT-5.6 Sol · essay writingGPT-5.5 · essay writingGPT-5.6 Luna · essay writingGPT-5.6 Terra · essay writingGPT-5.3-Codex · essay writingClaude Opus 4.6 · essay writingGrok 4.5 · essay writingQwen3.7 Max · essay writingGemini 3.1 Pro Preview · essay writingClaude Opus 4.8 · summarising documentsGPT-5.5 · summarising documentsGPT-5.6 Luna · summarising documentsGPT-5.6 Terra · summarising documentsGPT-5.3-Codex · summarising documentsDeepSeek V4 Pro · summarising documentsGPT-5.6 Sol · summarising documentsClaude Opus 4.6 · summarising documentsClaude Fable 5 · summarising documentsGPT-5.5 · job applications
Every claim we hold (3)
- api price in per 1m2 USD/1M tokensOpenRouter API17 Aug 2026verified
- api price out per 1m10 USD/1M tokensOpenRouter API17 Aug 2026verified
- context length1000000 tokensOpenRouter API17 Aug 2026verified