Model Comparison

Claude Opus 4.6 vs GPT-5.5

GPT-5.5 has a slight edge in benchmark performance. Claude Opus 4.6 is 1.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

13 benchmarks

Claude Opus 4.6 outperforms in 6 benchmarks (Finance Agent, Graphwalks BFS >128k, Graphwalks parents >128k, Humanity's Last Exam, MRCR v2 (8-needle), Tau2 Telecom), while GPT-5.5 is better at 7 benchmarks (ARC-AGI v2, BrowseComp, CyberGym, GPQA, MCP Atlas, MMMU-Pro, Terminal-Bench 2.0).

GPT-5.5 has a slight edge in benchmark performance.

Wed May 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Opus 4.6 costs less

For input processing, Claude Opus 4.6 ($5.00/1M tokens) costs the same as GPT-5.5 ($5.00/1M tokens).

For output processing, Claude Opus 4.6 ($25.00/1M tokens) is 1.2x cheaper than GPT-5.5 ($30.00/1M tokens).

In conclusion, GPT-5.5 is more expensive than Claude Opus 4.6.*

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

Lowest available price from all providers
Wed May 13 2026 • llm-stats.com
Anthropic
Claude Opus 4.6
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-5.5
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.5 accepts 1,050,000 input tokens compared to Claude Opus 4.6's 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Opus 4.6
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.5
Input1,050,000 tokens
Output128,000 tokens
Wed May 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.6 and GPT-5.5 support multimodal inputs.

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

Claude Opus 4.6

Text
Images
Audio
Video

GPT-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 Opus 4.6

Proprietary

Closed source

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.6 was released on 2026-02-05, while GPT-5.5 was released on 2026-04-23.

GPT-5.5 is 3 months newer than Claude Opus 4.6.

Claude Opus 4.6

Feb 5, 2026

3 months ago

GPT-5.5

Apr 23, 2026

2 weeks ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while Claude Opus 4.6's cutoff date is not specified.

We can confirm GPT-5.5's training data extends to 2025-12-01, but cannot make a direct comparison without Claude Opus 4.6's cutoff date.

Claude Opus 4.6

—

GPT-5.5

Dec 2025

Provider Availability

Claude Opus 4.6 is available from Anthropic. GPT-5.5 is available from OpenAI.

Claude Opus 4.6

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

GPT-5.5

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Less expensive output tokens
Higher Finance Agent score (60.7% vs 60.0%)
Higher Graphwalks BFS >128k score (61.5% vs 45.4%)
Higher Graphwalks parents >128k score (95.4% vs 58.5%)
Higher Humanity's Last Exam score (53.1% vs 52.2%)
Higher MRCR v2 (8-needle) score (93.0% vs 74.0%)
Higher Tau2 Telecom score (99.3% vs 98.0%)
OpenAI
Larger context window (1,050,000 tokens)
Higher ARC-AGI v2 score (85.0% vs 68.8%)
Higher BrowseComp score (84.4% vs 84.0%)
Higher CyberGym score (81.8% vs 73.8%)
Higher GPQA score (93.6% vs 91.3%)
Higher MCP Atlas score (75.3% vs 62.7%)
Higher MMMU-Pro score (83.2% vs 77.3%)
Higher Terminal-Bench 2.0 score (82.7% vs 65.4%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.6
OpenAI
GPT-5.5

FAQ

Common questions about Claude Opus 4.6 vs GPT-5.5.

Which is better, Claude Opus 4.6 or GPT-5.5?

GPT-5.5 has a slight edge in benchmark performance. Claude Opus 4.6 is made by Anthropic and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.6 compare to GPT-5.5 in benchmarks?

Claude Opus 4.6 scores Vending-Bench 2: 100.0%, AIME 2025: 99.8%, Tau2 Telecom: 99.3%, Graphwalks parents >128k: 95.4%, MRCR v2 (8-needle): 93.0%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

Is Claude Opus 4.6 cheaper than GPT-5.5?

Both models cost $5.00 per million input tokens.

What are the context window sizes for Claude Opus 4.6 and GPT-5.5?

Claude Opus 4.6 supports 1.0M tokens and GPT-5.5 supports 1.1M 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 4.6 and GPT-5.5?

Key differences include context window (1.0M vs 1.1M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.6 and GPT-5.5?

Claude Opus 4.6 is developed by Anthropic and GPT-5.5 is developed by OpenAI.