Claude 3.5 Haiku vs Claude Opus 4.5
Claude Opus 4.5 leads the LLM Stats Score 38.2 to 5.2. Claude 3.5 Haiku is 6.3x cheaper per token.
Anthropic · Anthropic · Updated for 2026
Which is better?
Claude Opus 4.5 leads the overall LLM Stats Score 38.2 to 5.2, ranking #66 overall.
In the 2 individual benchmarks reported for both models, Claude Opus 4.5 wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, Claude 3.5 Haiku is roughly 6.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude 3.5 Haiku
- cost matters — it's about 6.3x cheaper per token
Choose Claude Opus 4.5
- overall performance matters — it scores 38.2 and ranks #66 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you want the most recent training data — it shipped Nov 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
9 reported for Claude 3.5 Haiku · 11 for Claude Opus 4.5
Claude 3.5 Haiku outperforms in 0 benchmarks, while Claude Opus 4.5 is better at 2 benchmarks (GPQA, SWE-Bench Verified).
Claude Opus 4.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude 3.5 Haiku ($0.80/1M tokens) is 6.3x cheaper than Claude Opus 4.5 ($5.00/1M tokens).
For output processing, Claude 3.5 Haiku ($4.00/1M tokens) is 6.3x cheaper than Claude Opus 4.5 ($25.00/1M tokens).
In conclusion, Claude Opus 4.5 is more expensive than Claude 3.5 Haiku.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 200,000 tokens. Claude 3.5 Haiku can generate longer responses up to 200,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Opus 4.5 supports multimodal inputs, whereas Claude 3.5 Haiku does not.
Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude 3.5 Haiku
Claude Opus 4.5
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude 3.5 Haiku was released on 2024-10-22, while Claude Opus 4.5 was released on 2025-11-24.
Claude Opus 4.5 is 13 months newer than Claude 3.5 Haiku.
Oct 22, 2024
1.9 years ago
Nov 24, 2025
10 months ago
1.1yr newerKnowledge Cutoff
When training data ends
Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Claude 3.5 Haiku's cutoff date is not specified.
We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Claude 3.5 Haiku's cutoff date.
—
Mar 2025
Provider Availability
Claude 3.5 Haiku is available from Bedrock, Google, Anthropic. Claude Opus 4.5 is available from Anthropic.
Claude 3.5 Haiku
Claude Opus 4.5
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3.5 Haiku and Claude Opus 4.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3.5 Haiku vs Claude Opus 4.5.