Model Comparison

Claude Opus 4.5 vs Claude Haiku 4.5Which is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Haiku 4.5 is 5.0x cheaper per token.

Verdict: Claude Opus 4.5 vs Claude Haiku 4.5 — which is better?

Claude Opus 4.5 (by Anthropic) and Claude Haiku 4.5 (by Anthropic) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Opus 4.5 outperforms in 7 benchmarks (GPQA, MMMLU, MMMU (validation), OSWorld, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while Claude Haiku 4.5 is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

On price, Claude Haiku 4.5 is roughly 5.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 7 of 7 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025

Choose Claude Haiku 4.5 if…

  • cost matters — it's about 5.0x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

Claude Opus 4.5 outperforms in 7 benchmarks (GPQA, MMMLU, MMMU (validation), OSWorld, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while Claude Haiku 4.5 is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Tue Jul 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Haiku 4.5 costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 5.0x more expensive than Claude Haiku 4.5 ($1.00/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 5.0x more expensive than Claude Haiku 4.5 ($5.00/1M tokens).

In conclusion, Claude Opus 4.5 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 Jul 14 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Anthropic
Claude Haiku 4.5
Input tokens$1.00
Output tokens$5.00
Best providerAnthropic
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 200,000 tokens. Both models can generate responses up to 64,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Anthropic
Claude Haiku 4.5
Input200,000 tokens
Output64,000 tokens
Tue Jul 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

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

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

Claude Opus 4.5

Text
Images
Audio
Video

Claude Haiku 4.5

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 Opus 4.5

Proprietary

Closed source

Claude Haiku 4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Claude Haiku 4.5 was released on 2025-10-15.

Claude Opus 4.5 is 1 month newer than Claude Haiku 4.5.

Claude Opus 4.5

Nov 24, 2025

7 months ago

1mo newer
Claude Haiku 4.5

Oct 15, 2025

9 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a knowledge cutoff of 2025-03-31, while Claude Haiku 4.5 has a cutoff of 2025-02-01.

Claude Opus 4.5 has more recent training data (up to 2025-03-31), making it potentially better informed about events through that date compared to Claude Haiku 4.5 (2025-02-01).

Claude Opus 4.5

Mar 2025

1 mo newer
Claude Haiku 4.5

Feb 2025

Provider Availability

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

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Claude Haiku 4.5

anthropic logo
Anthropic
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
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Higher GPQA score (87.0% vs 73.0%)
Higher MMMLU score (90.8% vs 83.0%)
Higher MMMU (validation) score (80.7% vs 73.2%)
Higher OSWorld score (66.3% vs 50.7%)
Higher SWE-Bench Verified score (80.9% vs 73.3%)
Higher Tau2 Retail score (88.9% vs 83.2%)
Higher Tau2 Telecom score (98.2% vs 83.0%)
Anthropic
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Claude Opus 4.5
✓ Preferred
Claude Haiku 4.5
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Anthropic
Claude Haiku 4.5

FAQ

Common questions about Claude Opus 4.5 vs Claude Haiku 4.5.

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

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and Claude Haiku 4.5 is made by Anthropic. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

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

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. 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%.

Is Claude Opus 4.5 cheaper than Claude Haiku 4.5?

Claude Haiku 4.5 is 5.0x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output via anthropic.

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

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

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

Key differences include input pricing ($5.00 vs $1.00/M). See the full comparison above for benchmark-by-benchmark results.

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