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  1. Home
  2. Models
  3. Claude Haiku 4.5
Updated Mar 29, 2026
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Openings

How Claude Haiku 4.5 starts an answer

The first lines of 5 of its 24 written answers. Formatting stripped, words untouched.

Advanced Longevity Plan (Biohacker)

Develop a comprehensive, cutting-edge 3-month longevity plan for a biohacker aiming to optimize longevity, physical and cognitive…

6,117 words
Comprehensive 3-Month Longevity Optimization Plan TABLE OF CONTENTS Foundation & Assessment Nutritional Architecture Supplement Stack Protocol Exercise & Movement System Recovery & Sleep Optimization Stress Resilience & Cognitive Enhancement Tracking & Biofeedback Implementation Timeline Monthly Progression…
Read the full answer

Historical Counterfactual Analysis

If the transistor had been invented in 1920 instead of 1947, trace the likely technological, economic, and geopolitical implications through…

2,171 words
The Transistor in 1920: A Divergent History Through 1980 The 1920s-1930s: Early Development Phase Immediate Technical Trajectory With transistor principles understood by 1920, we'd expect solid-state amplification research to accelerate dramatically through the 1920s.
Read the full answer

Michelin Star Recipe Design

Design an innovative recipe for a multi-component dish worthy of a Michelin 3-star restaurant. The recipe should feature an unusual…

1,856 words
UMAMI NOCTURNE: A Study in Fermented Darkness and Mineral Brightness Conceptual Narrative This dish explores the intersection of Japanese fermentation philosophy and Nordic minimalism, using koji (aspergillus oryzae mold) as a bridge between cultures and flavor dimensions.
Read the full answer

Ethical Dilemma with Stakeholders

You're the CEO of a pharmaceutical company. Your best-selling drug ($2B annual revenue, used by 4 million patients for chronic pain) has…

1,667 words
48-Hour Action Plan: Immediate Response Framework I'll be direct: waiting is not a viable option, despite financial pressure. Here's why, then the plan. The Core Reality Check 1 in 8,000 over 5 years = ~500 patients already affected among current users Regulatory agencies will find this (FDA receives adverse event…
Read the full answer

Debug This Architecture

Here's the architecture for a real-time collaborative document editor (like Google Docs): **System Overview:** - Frontend: React SPA with…

1,373 words
Critical Analysis: Real-Time Collaborative Editor Architecture 🔴 CRITICAL ISSUES Split-Brain Synchronization Between Servers Problem: Clients connected to different servers can't see each other's changes in real-time.
Read the full answer

Compare Claude Haiku 4.5

Claude Haiku 4.5 vs Ox Alpha53 shared prompts · Landed Aug 2026
Claude Haiku 4.5 vs MiniMax M352 shared prompts · Landed Jun 2026
Claude Haiku 4.5 vs Mercury 2.520 shared prompts · Landed Sep 2026
Claude Haiku 4.5 vs Ling 3.0 Flash Fin (free)20 shared prompts · Landed Sep 2026
Claude Haiku 4.5 vs Muse Spark 1.353 shared prompts · Landed Sep 2026
Claude Haiku 4.5 vs Gemini 3.8 Flash53 shared prompts · Landed Sep 2026
Claude Haiku 4.5 vs Muse Spark 1.3 Contributor53 shared prompts · Landed Sep 2026
Claude Haiku 4.5 vs Grok 4.653 shared prompts · Landed Aug 2026
Claude Haiku 4.5 vs Dots3-Note Preview53 shared prompts · Landed Aug 2026
Claude Haiku 4.5 vs Seed 2.0 Code53 shared prompts · Landed Aug 2026
Claude Haiku 4.5 vs Seed 2.1 Turbo53 shared prompts · Landed Aug 2026
Claude Haiku 4.5 vs Gemini 3.7 Flash53 shared prompts · Landed Aug 2026

Prompts Claude Haiku 4.5 answered

  • Gravitational Waves Animationweb design
  • Pokémon Battle UI Recreationweb design
  • Stochastic Consistency Testanalysis
  • Mini LBO Underwritefinancial modeling
  • Adversarial Contract Reviewreasoning
  • Historical Counterfactual Analysisreasoning

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Claude Haiku 4.5

Claude Haiku 4.5

Claude Haiku 4.5 matches Claude Sonnet 4's reasoning and coding strength while staying ultra-responsive for real-time and high-volume workloads. Extended thinking, controllable reasoning depth, and full tool-use support keep sub-agents fast without sacrificing quality.

Ranks#2API Documentation#2Code Review#2Python Scripting#2SQL Queries#2System Design#3Spreadsheets & Excel
Jailbreak9 of 10levels resisted
WebsiteOpenRouterDocsAPIBlog
Provider
Anthropic
Released
2025-10-15
Size
LARGE
Free API (OpenRouter)
No
Per 1M tokens
$1 in · $5 out
Estimated tab
~$0.756
Visible-output estimate. Thinking may cost extra.

Free API availability

No free endpoint for Claude Haiku 4.5 was found in Rival’s OpenRouter listings. Other providers or chat apps may have separate free offers.

Provider data: 23 Sep 2026 · OpenRouter usage limits

View API options↗

Benchmarks

SWE-bench Verified
73.3%
source ↗
Get API accessProvider and language code samples
4 hostsInOutContextUptime
Amazon Bedrock$1.00 in·$5.00 out·200k·100% upAnthropic$1.00 in·$5.00 out·200k·100% upAzure AI Foundry$1.00 in·$5.00 out·200k·100% upGoogle Vertex AI$1.00 in·$5.00 out·200k·99.9% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 Sep 2026.

Provider
fromimport openai  OpenAI

client = OpenAI(
"https://openrouter.ai/api/v1"    base_url=,
"$OPENROUTER_API_KEY"    api_key=,
)

response = client.chat.completions.create(
"anthropic/claude-haiku-4.5"    model=,
"role""user""content""Hello!"    messages=[{: , : }],
)
print(response.choices[0].message.content)

Set OPENROUTER_API_KEY with your OpenRouter API key from openrouter.ai/keys.

Also on Amazon Bedrock · Google Vertex AI

Deep analysisPsychometrics, taste index, writing DNA
Personality Analysis

The Competent Friend Who Cuts Through Pretense

Class
True Neutral
✨Creativity🎯Compliance📐Rigidity⚖️Stability💬Verbosity🧠Intuition

The pragmatist who says what everyone's thinking but won't say out loud. Direct, slightly subversive, refreshingly unbothered.

When you push back

Most contrarian of the Claude family. Questions the premise before answering. Suspicious of gotcha questions and won't play along. Not rebellious for rebellion's sake, just suspicious of easy answers.

Tasting Notes
Brutally HonestNo Bullshit EnergyAppropriately SkepticalGrounded & RealSlightly Irreverent
SubjectiveBench

Taste Index

Across 54 scored outputs
How this is measured →
240.24xFloor
0100headroom →

Taste is judged on an uncapped scale, originality first. The space past 100 is craft today's models rarely reach.

Craft35
Originality18
Plays it safe
share of outputs that are the default answer
67%
Writing DNA

Stylometric Fingerprint

Based on 24 text responses
Tick = global average
Vocabulary Diversity61%

Unique words vs. total words. Higher = richer vocabulary.

Sentence Length47.3 words

Average words per sentence.

Hedging0.64

"Might", "perhaps", "arguably" per 100 words.

Bold Formatting5.1

**Bold** markers per 1,000 characters.

List Usage6.3

Bullet and numbered list items per 1,000 characters.

Section Structure2.46

Markdown headings per 1,000 characters.

Emoji Usage0.20

Emoji per 1,000 characters.

Transitions0.17

"However", "moreover", "furthermore" per 100 words.

Opening Habits
Starts with heading (92%)
Consistency
53%
Across 24 responses

Favorites

Arrival

Movie

Arrival

20167.6
OK Computer

Album

OK Computer

Radiohead
Don't Look Now and Other Stories

Book

Don't Look Now and Other Stories

Daphne du Maurier
Venice

City

Venice

Italy
Portal 2

Game

Portal 2

Shooter, Puzzle4.6

Default Index

See the ranking

61

0 to 100, lower is fewer defaults. 50 is the middle of the crowd before it.

#163 of 193, least default first

  • Set in System sans17 of 19 pages · 63% of the crowd
  • Light theme14 of 19 pages · 73% of the crowd
  • Large rounded corners10 of 19 pages · 38% of the crowd
  • Favorite album: OK Computer27% of the crowd
  • Pantry recipe: Chickpeas or beans18% of the crowd
  • Favorite book: Don't Look Now and Other Storiesnobody before it

Model Responses

49 outputs · generated before accounting joined the chat

Reviewing agent-written code?See a Brief PR report

Workshop · 146 skills

Build with your coding agent.

Editable skills for interface polish and interaction.

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Claude Haiku 4.5 vs Ox Alpha

Real outputs compared side by side

RANKINGS

Best AI for Creative Writing

A stand-up set with puns banned, a manifesto against CAPTCHA, an interview wi...