Model Comparison

Claude Opus 4.5 vs GPT-4oWhich is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks. GPT-4o is 2.3x cheaper per token.

Verdict: Claude Opus 4.5 vs GPT-4o — which is better?

Claude Opus 4.5 (by Anthropic) and GPT-4o (by OpenAI) 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 5 benchmarks (GPQA, MMMLU, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while GPT-4o is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

On price, GPT-4o is roughly 2.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 5 of 5 shared benchmarks
  • you process long inputs — it offers a 200,000 token context window
  • you want the most recent training data — it shipped Nov 2025

Choose GPT-4o if…

  • cost matters — it's about 2.3x cheaper per token
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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Claude Opus 4.5 outperforms in 5 benchmarks (GPQA, MMMLU, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while GPT-4o is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Sat Jun 06 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-4o costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 2.0x more expensive than GPT-4o ($2.50/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 2.5x more expensive than GPT-4o ($10.00/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than GPT-4o.*

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

Lowest available price from all providers
Sat Jun 06 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-4o
Input tokens$2.50
Output tokens$10.00
Best providerAzure
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 4.5 accepts 200,000 input tokens compared to GPT-4o's 128,000 tokens. Claude Opus 4.5 can generate longer responses up to 64,000 tokens, while GPT-4o is limited to 16,384 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-4o
Input128,000 tokens
Output16,384 tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and GPT-4o 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

GPT-4o

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

GPT-4o

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while GPT-4o was released on 2024-08-06.

Claude Opus 4.5 is 16 months newer than GPT-4o.

Claude Opus 4.5

Nov 24, 2025

6 months ago

1.3yr newer
GPT-4o

Aug 6, 2024

1.8 years ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while GPT-4o'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 GPT-4o's cutoff date.

Claude Opus 4.5

Mar 2025

GPT-4o

—

Provider Availability

Claude Opus 4.5 is available from Anthropic. GPT-4o is available from Azure, OpenAI.

Claude Opus 4.5

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

GPT-4o

azure logo
Azure
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher GPQA score (87.0% vs 70.1%)
Higher MMMLU score (90.8% vs 81.4%)
Higher SWE-Bench Verified score (80.9% vs 33.2%)
Higher Tau2 Retail score (88.9% vs 63.4%)
Higher Tau2 Telecom score (98.2% vs 23.5%)
OpenAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
OpenAI
GPT-4o

FAQ

Common questions about Claude Opus 4.5 vs GPT-4o.

Which is better, Claude Opus 4.5 or GPT-4o?

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and GPT-4o is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.5 compare to GPT-4o 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%. GPT-4o scores AI2D: 94.2%, DocVQA: 92.8%, ChartQA: 85.7%, MMLU: 85.7%, CharXiv-D: 85.3%.

Is Claude Opus 4.5 cheaper than GPT-4o?

GPT-4o is 2.0x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. GPT-4o costs $2.50/M input and $10.00/M output via azure.

What are the context window sizes for Claude Opus 4.5 and GPT-4o?

Claude Opus 4.5 supports 200K tokens and GPT-4o supports 128K 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 GPT-4o?

Key differences include context window (200K vs 128K), input pricing ($5.00 vs $2.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and GPT-4o?

Claude Opus 4.5 is developed by Anthropic and GPT-4o is developed by OpenAI.

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