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Claude Haiku 4.5 vs Claude Opus 4.6

How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Haiku 4.5 and Claude Opus 4.6.

Anthropic

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...

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Anthropic

Claude Opus 4.6

Opus 4.6 is Anthropic’s strongest model for coding and long-running professional tasks. It is built for agents that operate across entire workflows rather than single prompts, making it especially effective...

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Technical Specifications

SpecificationClaude Haiku 4.5Claude Opus 4.6
ProviderAnthropicAnthropic
Context Window200,000 tokens1,000,000 tokens
Agent Suitability87/10095/100
Time to First Token (TTFT)180 ms500 ms
Deployment Modelmanaged apimanaged api
Production Stabilitystablestable
API AvailableYesYes
Released Date2025-10-152026-02-04

API Pricing Comparison

Input Price per Million Tokens

Claude Haiku 4.5

$1.00

Claude Opus 4.6

$5.00

Output Price per Million Tokens

Claude Haiku 4.5

$5.00

Claude Opus 4.6

$25.00

Want to test both models live?

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Benchmark Performance Metrics

Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.

MMLUGeneral knowledge & multi-task understanding
8480.0%vs9250.0%
Claude Haiku 4.5
Claude Opus 4.6
HumanEvalPython coding & logic synthesis
8600.0%vs9450.0%
Claude Haiku 4.5
Claude Opus 4.6
MATHComplex mathematical problem solving
7500.0%vs8890.0%
Claude Haiku 4.5
Claude Opus 4.6
GPQAGraduate-level expert reasoning
5500.0%vs7980.0%
Claude Haiku 4.5
Claude Opus 4.6
HellaSwagCommonsense reasoning and inference
9350.0%vs9750.0%
Claude Haiku 4.5
Claude Opus 4.6
MT-BenchMulti-turn conversation flow quality
890.0%vs965.0%
Claude Haiku 4.5
Claude Opus 4.6

Claude Haiku 4.5 Quirks & Gotchas

  • ▸Fastest TTFT in the Claude lineup — ideal for real-time chat
  • ▸Tool calling limited compared to Sonnet — best for simple classification and routing

Claude Opus 4.6 Quirks & Gotchas

  • ▸Best for long-context document analysis and legal review
  • ▸Tool calling requires structured prompt — prone to verbose refusal without explicit output schema