Claude Sonnet 4.5
Claude Sonnet 4.5Alternatives?
CheaperGrok 4.5high+90%-50%$0.76Context: 1M → 500K
OpenKimi K3max+47%same$2.00Sampling parameters are fixed+3
CheaperMuse Spark 1.1xhigh+60%-67%$1.69Only n=1 · Meta / Chat Completions+1
CheaperGPT-5.4xhigh+56%-6%$2.50 / $15
CheaperGLM 5.2xhighOpen+47%-64%$1.40 / $4.40No image inputGrok 4.5high+90%-50%$0.76Context: 1M → 500KMuse Spark 1.1xhigh+60%-67%$1.69Only n=1 · Meta / Chat Completions+1GPT-5.4xhigh+56%-6%$2.50 / $15GLM 5.2xhighOpen+47%-64%$1.40 / $4.40No image inputGPT-5.2high+28%-20%$1.75 / $14Context: 1M → 400KGrok 4.5high+90%-50%$0.76Context: 1M → 500KGPT-5.6 Solxhigh+86%+33%$1.18Muse Spark 1.1xhigh+60%-67%$1.69Only n=1 · Meta / Chat Completions+1Kimi K3maxOpen+47%same$2.00Sampling parameters are fixed+3GPT-5.5xhigh+77%+88%$2.10Prompts with >272K input tokensKimi K3maxOpen+47%same$2.00Sampling parameters are fixed+3GLM 5.2xhighOpen+47%-64%$1.40 / $4.40No image inputTInklingmaxOpensame-71%$0.95 / $4.05Context: 1M → 256K+1
Qwen3.5 397B A17BenabledOpen-61%-78%$0.60 / $3.60Context: 1M → 262KGLM 5enabledOpen-61%-74%$1 / $3.20Context: 1M → 203K+1Claude Opus 5max+93%—$5.86Claude Opus 4.7max+59%—$5 / $25Claude Fable 5max+57%—$8.75Claude Opus 4.8max+57%—$4.08Claude Opus 4.6max+8%—$5 / $25Claude Opus 4.5highsame—$5 / $25Context: 1M → 200KClaude Haiku 5.5mediumn/a—$0.047Remove sampling parameters+5Claude Sonnet 5.5highn/a—$0.88No forced tool use+5All Anthropic models →Benchmarks
in Agents & Tool UseFAQ
How much does Claude Sonnet 4.5 cost?›
$3 per 1M input tokens and $15 per 1M output tokens; cached input $0.30 per 1M.
Is Claude Sonnet 4.5 free to use?›
There is no free API; the cheapest paid price is $3 per 1M input tokens.
How good is Claude Sonnet 4.5, and what is it best at?›
#134 of 336 in Chat & Knowledge, #77 of 134 in Coding, #72 of 135 in Agents & Tool Use, #29 of 197 in Writing & Language, #76 of 125 in Vision & Documents. Strongest at: Knowledge.
Is Claude Sonnet 4.5 better than Gemini 3.1 Pro Preview?›
On τ³-bench · banking · 1.0.1, Claude Sonnet 4.5 scores 25.3 vs 26 — about the same.
How can I use Claude Sonnet 4.5?›
Through the API of Amazon Bedrock, Anthropic, Azure, Claude Platform on AWS, Google.
What is the context window of Claude Sonnet 4.5?›
1M tokens, with up to 64K output tokens.
When was Claude Sonnet 4.5 released? Is there a newer version?›
Released 2025-09-29. It has been superseded by Claude Sonnet 5.5.
Is Claude Sonnet 4.5 open source?›
No, Claude Sonnet 4.5 is a closed model available through an API. The closest open-weights option here is Kimi K3.
Can Claude Sonnet 4.5 read images?›
It accepts text and images, PDF files as input.
What is Claude Sonnet 4.5?›
Claude Sonnet 4.5 is a closed language model from Anthropic, released Sep 2025.
What are the best alternatives to Claude Sonnet 4.5?›
Grok 4.5 (cheaper), Kimi K3 (open weights).