Claude Sonnet 4.5
Claude Sonnet 4.5Alternatives?
CheaperGemini 3 Flash Previewthinking+27%-81%$0.50 / $3
BetterGPT OSS 20BhighOpen+9%-98%$0.011Context: 1M → 131K+1
OpenDeepSeek V3.2 Specialethinking+25%——Context: 1M → 128K+1
CheaperGLM 4.7thinkingOpen+25%-83%$0.60 / $2.20Context: 1M → 203K+1CheaperGPT-5.2medium+25%-20%$1.75 / $14Context: 1M → 400KGemini 3 Flash Previewthinking+27%-81%$0.50 / $3GLM 4.7thinkingOpen+25%-83%$0.60 / $2.20Context: 1M → 203K+1GPT-5.2medium+25%-20%$1.75 / $14Context: 1M → 400KGPT OSS 120BhighOpen+23%-83%$0.092Context: 1M → 131K+1GPT-5.1high+21%-43%$1.25 / $10Context: 1M → 400KGPT OSS 20BhighOpen+9%-98%$0.011Context: 1M → 131K+1
Nemotron 3 Nano 30B A3BthinkingOpen+4%-97%$0.017Context: 1M → 131K+1GPT-5 Minihigh+17%-90%$0.053Context: 1M → 400KGPT OSS 120BhighOpen+23%-83%$0.092Context: 1M → 131K+1Gemini 2.5 Prothinking+12%-41%$0.33DeepSeek V3.2 SpecialethinkingOpen+25%——Context: 1M → 128K+1GLM 4.7thinkingOpen+25%-83%$0.60 / $2.20Context: 1M → 203K+1GPT OSS 120BhighOpen+23%-83%$0.092Context: 1M → 131K+1
Kimi K2 ThinkingthinkingOpen+19%-86%$0.47 / $2Context: 1M → 256K+1
MiniMax M2thinkingOpen+16%-91%$0.30 / $1.20Context: 1M → 205K+1Claude Opus 4.5non-thinking+3%—$5 / $25Context: 1M → 200KClaude Haiku 4.5non-thinking-28%—$1 / $5Context: 1M → 200KClaude Haiku 5.5mediumn/a—$0.047Remove sampling parameters+5Claude Sonnet 5.5highn/a—$0.88No forced tool use+5Claude Opus 5.5mediumn/a—$1.34No forced tool use+5Claude Fable 5.1mediumn/a—$2.98Replace forced tool_choice+5Claude Opus 5mediumn/a—$2.19Claude Sonnet 5mediumn/a—$1.00All Anthropic models →History
7 versionsBenchmarks
in CodingFAQ
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?›
#132 of 334 in Chat & Knowledge, #75 of 132 in Coding, #70 of 133 in Agents & Tool Use, #21 of 195 in Writing & Language, #75 of 124 in Vision & Documents. Strongest at: Knowledge.
Is Claude Sonnet 4.5 better than NVIDIA Nemotron Nano 9B V2?›
On LiveCodeBench · AA archived, Claude Sonnet 4.5 scores 71.4 vs 72.4 — 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 DeepSeek V3.2 Speciale.
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?›
Gemini 3 Flash Preview (cheaper), GPT OSS 20B (better), DeepSeek V3.2 Speciale (open weights).