Anthropic: Claude Haiku 4.5
anthropic/claude-haiku-4-5
Access Claude Haiku 4.5 from Anthropic using Puter.js AI API.
Get Started// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';
puter.ai.chat("Explain quantum computing in simple terms", {
model: "anthropic/claude-haiku-4-5"
}).then(response => {
document.body.innerHTML = response.message.content;
});
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "anthropic/claude-haiku-4-5"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://api.puter.com/puterai/openai/v1/",
api_key="YOUR_PUTER_AUTH_TOKEN",
)
response = client.chat.completions.create(
model="anthropic/claude-haiku-4-5",
messages=[
{"role": "user", "content": "Explain quantum computing in simple terms"}
],
)
print(response.choices[0].message.content)
curl https://api.puter.com/puterai/openai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_PUTER_AUTH_TOKEN" \
-d '{
"model": "anthropic/claude-haiku-4-5",
"messages": [
{"role": "user", "content": "Explain quantum computing in simple terms"}
]
}'
Model Card
Claude Haiku 4.5 is Anthropic's small, fast model released October 2025, optimized for low latency and cost. Despite being the cheapest option ($1/$5 per million tokens), it matches Sonnet 4 on coding benchmarks (73.3% SWE-bench).
Context Window 200K
tokens
Max Output 64K
tokens
Input Cost $1
per million tokens
Output Cost $5
per million tokens
Input text, image, pdf
modalities
Tool Use Yes
Knowledge Cutoff Feb 28, 2025
Release Date Oct 15, 2025
Output Speed 94
tokens / sec
Latency 0.67s
time to first token
Model Playground
Try Claude Haiku 4.5 instantly in your browser.
This playground uses the Puter.js AI API — no API keys or setup required.
Benchmarks
How Claude Haiku 4.5 performs on standard evaluations.
| Benchmark | Score |
|---|---|
| GPQA Diamond Graduate-level science Q&A | 64.6% |
| Humanity's Last Exam Cross-domain reasoning | 4.3% |
| LiveCodeBench Recent coding problems | 51.1% |
| SciCode Scientific programming | 34.4% |
| AIME 2025 Advanced math exam | 39.0% |
| IFBench Instruction following | 42.0% |
| LCR Long-context reasoning | 43.7% |
| Terminal-Bench Hard Agentic terminal tasks | 27.3% |
| τ²-Bench Tool use / agents | 32.5% |
Scores sourced from Artificial Analysis.
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Claude Fable 5 is Anthropic's most capable generally available model — a publicly released, safety-hardened version of its frontier Mythos-class system, launched June 2026. It is state-of-the-art on nearly every benchmark Anthropic tested, with its lead over prior Claude models growing the longer and more complex the task. It scores 80.3% on SWE-bench Pro, well ahead of Claude Opus 4.8 (69.2%) and GPT-5.5 (58.6%). During early testing, Stripe used it to run a codebase-wide migration in a day that would have taken a team over two months by hand. It's also Anthropic's new state-of-the-art for vision tasks and can work autonomously longer than any previous Claude model. Priced at $10/$50 per million input/output tokens — less than half the cost of Claude Mythos Preview — it targets developers building agentic coding pipelines, vision-heavy workloads, and long-horizon autonomous tasks. Queries on a small set of sensitive topics fall back to Opus 4.8 (on average under 5% of sessions).
ChatClaude Opus 4.8
Claude Opus 4.8 is Anthropic's latest flagship AI model, building on Opus 4.7 with improvements across coding, reasoning, and knowledge work — at the same price point. The model excels at complex, multi-step agentic workflows including coding, financial analysis, legal reasoning, and browser-based computer use. Early testers report it outperforms both prior Opus models and GPT-5.5 across several agentic benchmarks. Notably, it's around four times less likely than Opus 4.7 to let flaws in generated code pass without flagging them. Opus 4.8 supports configurable effort levels, letting developers trade quality against speed and token cost. A fast mode operates at 2.5× speed. Priced at $5/$25 per million input/output tokens, it targets teams running autonomous agents, analysis pipelines, and long-running async workflows where reliability and judgment are critical.
Frequently Asked Questions
You can access Claude Haiku 4.5 by Anthropic through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required. You can also use it with Python or cURL via Puter's OpenAI-compatible API.
Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add Claude Haiku 4.5 to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.
| Price per 1M tokens | |
|---|---|
| Input | $1 |
| Output | $5 |
Claude Haiku 4.5 was created by Anthropic and released on Oct 15, 2025.
Claude Haiku 4.5 supports a context window of 200K tokens. For reference, that is roughly equivalent to 400 pages of text.
Claude Haiku 4.5 can generate up to 64K tokens in a single response.
Claude Haiku 4.5 has a knowledge cutoff date of Feb 28, 2025. This means the model was trained on data available up to that date.
Claude Haiku 4.5 accepts the following input types: text, image, pdf. It produces: text.
Yes, Claude Haiku 4.5 supports tool use (function calling), allowing it to interact with external tools, APIs, and data sources as part of its response flow.
Claude Haiku 4.5 scores 23.7 on the Artificial Analysis Intelligence Index, outperforming 67% of tracked models. On math, it scores 39.0 (outperforms 40% of models).
Yes — the Claude Haiku 4.5 API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.
Get started with Puter.js
Add Claude Haiku 4.5 to your app without worrying about API keys or setup.
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