anthropic/claude-haiku-4-5

Claude Haiku 4.5

Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models. Matching Claude Sonnet 4’s performance across reasoning, coding, and computer-use tasks, Haiku 4.5 brings frontier-level capability to real-time and high-volume applications. It introduces extended thinking to the Haiku line; enabling controllable reasoning depth, summarized or interleaved thought output, and tool-assisted workflows with full support for coding, bash, web search, and computer-use tools. Scoring >73% on SWE-bench Verified, Haiku 4.5 ranks among the world’s best coding models while maintaining exceptional responsiveness for sub-agents, parallelized execution, and scaled deployment.

10/15/2025

200,000 tokens

#39 Code (Overall)

Input: ¥16/M

Output: ¥870/M

Try in Chat Get API Key

Specifications

Modalities

Input

image

text

Output

text

Supported Parameters

include_reasoning

max_tokens

reasoning

response_format

stop

structured_outputs

temperature

tool_choice

tools

top_k

top_p

Max Output Tokens

64,000

Code Examples

curl https://api.fastmetal.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "anthropic-claude-haiku-4-5",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Leaderboard

Text

🏆OverallELO: 1,407

#76

🇯🇵JapaneseELO: 1,334

#69

🇨🇳ChineseELO: 1,427

#89

🇰🇷KoreanELO: 1,346

#69

🇬🇧EnglishELO: 1,427

#67

frenchELO: 1,425

#67

germanELO: 1,384

#75

spanishELO: 1,421

#44

russianELO: 1,386

#86

💻CodingELO: 1,477

#40

🧮MathELO: 1,393

#99

✍️Creative WritingELO: 1,382

#71

📝Instruction FollowingELO: 1,411

#58

🌶️Hard PromptsELO: 1,437

#60

💬Multi-TurnELO: 1,420

#59

Code

🏆OverallELO: 1,309

#39