Claude Sonnet 4.5
Claude Sonnet 4.5Alternatives?
CheaperGPT-6.1 Solxhigh×3.4-29%$0.39Remove unsupported parameters+5BetterGPT-6 Lunalow+79%-99%$0.005Function calling only with none · Chat Completions+3
OpenQwen3.8 2.4T A95Bthinking×2.9+287%$2.16Context: 1M → 262K+6CheaperClaude Haiku 5.5max×3.3-62%$0.21Remove sampling parameters+5CheaperGPT-6 Solxhigh×3.1-6%$0.52GPT-6.1 Solxhigh×3.4-29%$0.39Remove unsupported parameters+5Claude Haiku 5.5max×3.3-62%$0.21Remove sampling parameters+5GPT-6 Solxhigh×3.1-6%$0.52
DeepSeek V4.1 Flash 1017maxOpen×2.5-53%$0.26Pass back reasoning_content · Chat Completions+4GPT-6 Lunamax×2.5-88%$0.068Function calling only with none · Chat Completions+3GPT-6 Lunalow+79%-99%$0.005Function calling only with none · Chat Completions+3GPT-5.6 Lunalow+47%-98%$0.01Claude Haiku 5.5medium+53%-92%$0.047Remove sampling parameters+5
Muse Glimmer 30BhighOpen+89%-90%$0.058Context: 1M → 131KGPT-6.1 Sollow×2.5-77%$0.13Remove unsupported parameters+5Qwen3.8 2.4T A95BthinkingOpen×2.9+287%$2.16Context: 1M → 262K+6DeepSeek V4.1 Flash 1017maxOpen×2.5-53%$0.26Pass back reasoning_content · Chat Completions+4Qwen3.8 27BxhighOpen×2.2+106%$1.15Context: 1M → 262K+5
Kimi K3maxOpen×2.1+259%$2.00Sampling parameters are fixed+3Qwen3.8 FlashthinkingOpen+95%-33%$0.37Context: 1M → 262K+6Claude Opus 4.7high×2.7—$5 / $25Claude Opus 5.5medium×2.1+140%$1.34No forced tool use+5Claude Fable 5max+95%+1,471%$8.75Claude Sonnet 4.6non-thinking+89%—$3 / $15Claude Opus 4.8max+84%+633%$4.08Claude Sonnet 5.5high+79%+59%$0.88No forced tool use+5Claude Haiku 5.5medium+53%-92%$0.047Remove sampling parameters+5Claude Opus 5medium+32%+293%$2.19All Anthropic models →History
7 versionsBenchmarks
in Chat & KnowledgeFAQ
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. A typical benchmark task costs about $0.56 at default effort.
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 Kimi K2.6?›
On MLCR-AA, Claude Sonnet 4.5 scores 10.6 vs 11.1 — about the same. It is 21% cheaper per task.
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 Qwen3.8 2.4T A95B.
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?›
GPT-6.1 Sol (cheaper), GPT-6 Luna (better), Qwen3.8 2.4T A95B (open weights).