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Claude Haiku 4.5 vs Claude Opus 5.5

Claude Opus 5.5 leads the LLM Stats Score 59.8 to 25.7. Claude Haiku 4.5 is 4.0x cheaper per token.

Anthropic · Anthropic · Updated for 2026

Which is better?

Claude Opus 5.5 leads the overall LLM Stats Score 59.8 to 25.7, ranking #1 overall.

On price, Claude Haiku 4.5 is roughly 4.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 5.5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Haiku 4.5

  • cost matters — it's about 4.0x cheaper per token

Choose Claude Opus 5.5

  • overall performance matters — it scores 59.8 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Claude Haiku 4.5
Anthropic
Claude Opus 5.5
Anthropic
Core performance indexes
LLM Stats Score
25.7
#160
59.8
#1
Reasoning
25.3
#156
57.9
#1
Coding
19.6
#105
51.8
#1
Agents
13.4
#96
44.6
#2
Cost, coverage & limits
Benchmark wins
—
—
Input price
$1.00 / M
$4.00 / M
Output price
$5.00 / M
$20.00 / M
Context window
200,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Claude Haiku 4.5
Claude Opus 5.5
Math
15.6#215
42.5#5
Vision
8.6#138
42.9#1
Tool use
15.3#90
32.9#2
Multimodal
10.0#118
42.6#1
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

12 reported for Claude Haiku 4.5 · 31 for Claude Opus 5.5

No common benchmarks found

Claude Haiku 4.5 and Claude Opus 5.5don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Claude Haiku 4.5 costs less

For input processing, Claude Haiku 4.5 ($1.00/1M tokens) is 4.0x cheaper than Claude Opus 5.5 ($4.00/1M tokens).

For output processing, Claude Haiku 4.5 ($5.00/1M tokens) is 4.0x cheaper than Claude Opus 5.5 ($20.00/1M tokens).

In conclusion, Claude Opus 5.5 is more expensive than Claude Haiku 4.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Tue Sep 22 2026 • llm-stats.com
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
Anthropic
Claude Opus 5.5
Input tokens$4.00
Output tokens$20.00
Best providerAnthropic
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 5.5 accepts 1,000,000 input tokens compared to Claude Haiku 4.5's 200,000 tokens. Claude Opus 5.5 can generate longer responses up to 128,000 tokens, while Claude Haiku 4.5 is limited to 64,000 tokens.

Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
Anthropic
Claude Opus 5.5
Input1,000,000 tokens
Output128,000 tokens
Tue Sep 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Haiku 4.5 and Claude Opus 5.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Haiku 4.5

Text
Images
Audio
Video

Claude Opus 5.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Haiku 4.5

Proprietary

Closed source

Claude Opus 5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 4.5 was released on 2025-10-15, while Claude Opus 5.5 was released on 2026-09-22.

Claude Opus 5.5 is 11 months newer than Claude Haiku 4.5.

Claude Haiku 4.5

Oct 15, 2025

11 months ago

Claude Opus 5.5

Sep 22, 2026

0 days ago

11mo newer

Knowledge Cutoff

When training data ends

Claude Haiku 4.5 has a knowledge cutoff of 2025-02-01, while Claude Opus 5.5 has a cutoff of 2026-06-01.

Claude Opus 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to Claude Haiku 4.5 (2025-02-01).

Claude Haiku 4.5

Feb 2025

Claude Opus 5.5

Jun 2026

1.3 yr newer

Provider Availability

Claude Haiku 4.5 is available from Anthropic, DeepInfra, Vertex AI. Claude Opus 5.5 is available from Anthropic.

Claude Haiku 4.5

anthropic logo
Anthropic
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M
deepinfra logo
Deepinfra
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M
vertex logo
Unknown Organization
Input Price:Input: $1.00/1MOutput Price:Output: $5.00/1M

Claude Opus 5.5

anthropic logo
Anthropic
Input Price:Input: $4.00/1MOutput Price:Output: $20.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Haiku 4.5 and Claude Opus 5.5 side-by-side, then vote on the output you prefer.

Claude Haiku 4.5
✓ Preferred
Claude Opus 5.5
Open in Playground

FAQ

Common questions about Claude Haiku 4.5 vs Claude Opus 5.5.

Which is better, Claude Haiku 4.5 or Claude Opus 5.5?

Claude Opus 5.5 leads the LLM Stats Score 59.8 to 25.7. Claude Haiku 4.5 is made by Anthropic and Claude Opus 5.5 is made by Anthropic. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Haiku 4.5 compare to Claude Opus 5.5 in benchmarks?

Claude Haiku 4.5 scores Tau2 Retail: 83.2%, MMMLU: 83.0%, Tau2 Telecom: 83.0%, AIME 2025: 80.7%, SWE-Bench Verified: 73.3%. Claude Opus 5.5 scores BenchCAD (with Python tool): 96.2%, Global-MMLU: 94.3%, SWE-bench Multilingual: 93.9%, MILU: 93.1%, ArXivMath: 91.2%.

Is Claude Haiku 4.5 cheaper than Claude Opus 5.5?

Claude Haiku 4.5 is 4.0x cheaper for input tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic. Claude Opus 5.5 costs $4.00/M input and $20.00/M output via anthropic.

What are the context window sizes for Claude Haiku 4.5 and Claude Opus 5.5?

Claude Haiku 4.5 supports 200K tokens and Claude Opus 5.5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Haiku 4.5 and Claude Opus 5.5?

Key differences include LLM Stats Score (25.7 vs 59.8), context window (200K vs 1.0M), input pricing ($1.00 vs $4.00/M). See the full comparison above for benchmark-by-benchmark results.

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