Claude Opus 4.5
Claude Opus 4.5Alternatives?
CheaperClaude Opus 5.5max×4.7-20%$5.98No forced tool use+5
BetterGPT-6 Lunalow+54%-98%$0.005Function calling only with none · Chat Completions+3
OpenMiMo v2.6 Prothinking×3.7-95%$0.13Pass back reasoning_content+3
CheaperGemini 4 Argonhigh×4.3-60%*$1.99Synchronous output stops at 65,536+2CheaperClaude Sonnet 5.5max×4.2-60%$5.46No forced tool use+5Claude Opus 5.5max×4.7-20%$5.98No forced tool use+5Gemini 4 Argonhigh×4.3-60%*$1.99Synchronous output stops at 65,536+2Claude Sonnet 5.5max×4.2-60%$5.46No forced tool use+5GPT-6.1 Solmax×4-60%$0.72Remove unsupported parameters+5
Muse Wondermax×3.8-20%$4.52Only auto tool_choice is supported+5GPT-6 Lunalow+54%-98%$0.005Function calling only with none · Chat Completions+3GPT-5.6 Lunalow+51%-96%$0.01MiMo v2.5thinkingOpen×2.1-98%$0.019Claude Haiku 5.5low×2.1-98%$0.024Remove sampling parameters+5
Mercury 2high+30%-96%$0.039Context: 200K → 128K+1MiMo v2.6 ProthinkingOpen×3.7-95%$0.13Pass back reasoning_content+3
Kimi K3maxOpen×3.6-40%$2.00Sampling parameters are fixed+3
Step 5 PreviewthinkingOpen×3.5-86%$1.03web_search not available · Chat Completions+2Muse Spark OpenxhighOpen×3.3-80%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1
DeepSeek V4.1 Flash 1017maxOpen×3.3-95%$0.26Pass back reasoning_content · Chat Completions+4Claude Fable 5max×4.2—$8.75Claude Opus 5.5medium×4.2—$1.34No forced tool use+5Claude Fable 5.1medium×4.1—$2.98Replace forced tool_choice+5Claude Opus 5medium×3.9—$2.19Claude Opus 4.8max×3.7—$4.08Claude Sonnet 5.5high×3.5—$0.88No forced tool use+5Claude Haiku 5.5medium×2.6—$0.047Remove sampling parameters+5Claude Opus 4.7high×2.5—$5 / $25All Anthropic models →History
9 versionsBenchmarks
in Chat & KnowledgeFAQ
How much does Claude Opus 4.5 cost?›
$5 per 1M input tokens and $25 per 1M output tokens; cached input $0.50 per 1M.
Is Claude Opus 4.5 free to use?›
There is no free API; the cheapest paid price is $5 per 1M input tokens.
How good is Claude Opus 4.5, and what is it best at?›
#153 of 334 in Chat & Knowledge, #6 of 19 in Coding, #7 of 16 in Agents & Tool Use, #12 of 195 in Writing & Language, #67 of 124 in Vision & Documents. Strongest at: Tool calling, Knowledge.
Is Claude Opus 4.5 better than MiMo v2 Pro?›
On Humanity's Last Exam, Claude Opus 4.5 scores 30.1 vs 30.4 — about the same.
How can I use Claude Opus 4.5?›
Through the API of Amazon Bedrock, Anthropic, Azure, Claude Platform on AWS, Google.
What is the context window of Claude Opus 4.5?›
200K tokens, with up to 64K output tokens.
When was Claude Opus 4.5 released? Is there a newer version?›
Released 2025-11-24. It has been superseded by Claude Opus 4.6.
Is Claude Opus 4.5 open source?›
No, Claude Opus 4.5 is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.
Can Claude Opus 4.5 read images?›
It accepts text and images, PDF files as input.
What is Claude Opus 4.5?›
Claude Opus 4.5 is a closed language model from Anthropic, released Nov 2025.
What are the best alternatives to Claude Opus 4.5?›
Claude Opus 5.5 (cheaper), GPT-6 Luna (better), MiMo v2.6 Pro (open weights).