Is Claude Sonnet 4.5 out yet?
Yes.
About Claude Sonnet 4.5
A strong Sonnet upgrade for coding and everyday high-volume use.
How we confirmed it
Released via official access
September 29, 2025 at 12:00 AM UTC
Release timeline
Waiting for Anthropic's next model?
One click creates your free account (or signs you into an existing one) and turns on alerts for Anthropic releases. There's no password to set, and you can unsubscribe any time.
Benchmarks
Coding#25
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 14, 2026 · source
74.4
Agentic#40
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 14, 2026 · source
50.3
Reasoning#31
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 17, 2026 · source
60.8
Knowledge#30
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 17, 2026 · source
69.7
Math#16
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 3, 2026 · source
87.7
MultimodalGrounded#6
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 17, 2026 · source
90.7
Multilingual#14
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 17, 2026 · source
84
InstructionFollowing#28
Claude Sonnet 4.5 · via BenchLM.ai · captured Jul 17, 2026 · source
79.5
Humanity's Last Exam
claude-sonnet-4-5-20250929 · via Epoch AI · captured Aug 16, 2026 · source
7.5
LM Arena#58
claude-sonnet-4-5-20250929 · via LM Arena · 80,922 votes · captured Aug 16, 2026 · source
1454.872796728284
Sourced metrics mirrored with attribution - not community sentiment.
Data from BenchLM.ai.
Data from Epoch AI, “AI Benchmarking Hub” (CC BY 4.0).
Vibe rating
How this model actually feels to use, rated by the people here.
No vibe ratings yet. Be the first.
Sign in to rate this model.
Model Pulse
How is this model behaving today? One check-in per person per day: the running record of “did they nerf it”. Resets at midnight UTC.
No check-ins yet today. Be the first to log how this model is behaving.
Community consensus
An AI summary of the public comments here. Not a sourced fact.
Not enough public feedback yet to summarize. Add a comment to help build the picture.
Compare Claude Sonnet 4.5 with another model →
Also waiting on: Gemini 3.5 Pro, Claude Fable 5.1, Claude Mythos 5.1, GLM-6
Comments
Missing a model, or wishing OutYet did something it doesn't? Tell us what to build.