Model Comparison

Claude Opus 5 vs GPT-4.1 nanoWhich is better in 2026?

Comparing Claude Opus 5 and GPT-4.1 nano across benchmarks, pricing, and capabilities.

Verdict: Claude Opus 5 vs GPT-4.1 nano — which is better?

Claude Opus 5 (by Anthropic) and GPT-4.1 nano (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.

On price, GPT-4.1 nano is roughly 57.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-4.1 nano also accepts a larger context window (1,047,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 5 if…

  • you want the most recent training data — it shipped Jul 2026

Choose GPT-4.1 nano if…

  • cost matters — it's about 57.1x cheaper per token
  • you process long inputs — it offers a 1,047,576 token context window

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Claude Opus 5 and GPT-4.1 nanodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-4.1 nano costs less

For input processing, Claude Opus 5 ($5.00/1M tokens) is 50.0x more expensive than GPT-4.1 nano ($0.10/1M tokens).

For output processing, Claude Opus 5 ($25.00/1M tokens) is 62.5x more expensive than GPT-4.1 nano ($0.40/1M tokens).

In conclusion, Claude Opus 5 is more expensive than GPT-4.1 nano.*

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

Lowest available price from all providers
Sun Jul 26 2026 • llm-stats.com
Anthropic
Claude Opus 5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-4.1 nano
Input tokens$0.10
Output tokens$0.40
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-4.1 nano accepts 1,047,576 input tokens compared to Claude Opus 5's 1,000,000 tokens. Claude Opus 5 can generate longer responses up to 128,000 tokens, while GPT-4.1 nano is limited to 32,768 tokens.

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-4.1 nano
Input1,047,576 tokens
Output32,768 tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 5 and GPT-4.1 nano support multimodal inputs.

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

Claude Opus 5

Text
Images
Audio
Video

GPT-4.1 nano

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 5

Proprietary

Closed source

GPT-4.1 nano

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while GPT-4.1 nano was released on 2025-04-14.

Claude Opus 5 is 16 months newer than GPT-4.1 nano.

Claude Opus 5

Jul 24, 2026

1 days ago

1.3yr newer
GPT-4.1 nano

Apr 14, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

GPT-4.1 nano has a documented knowledge cutoff of 2024-05-31, while Claude Opus 5's cutoff date is not specified.

We can confirm GPT-4.1 nano's training data extends to 2024-05-31, but cannot make a direct comparison without Claude Opus 5's cutoff date.

Claude Opus 5

—

GPT-4.1 nano

May 2024

Provider Availability

Claude Opus 5 is available from Anthropic. GPT-4.1 nano is available from OpenAI.

Claude Opus 5

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

GPT-4.1 nano

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (1,047,576 tokens)
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Opus 5 and GPT-4.1 nano side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
GPT-4.1 nano
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 5
OpenAI
GPT-4.1 nano

FAQ

Common questions about Claude Opus 5 vs GPT-4.1 nano.

Which is better, Claude Opus 5 or GPT-4.1 nano?

Claude Opus 5 (Anthropic) and GPT-4.1 nano (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Opus 5 compare to GPT-4.1 nano in benchmarks?

Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%. GPT-4.1 nano scores MMLU: 80.1%, IFEval: 74.5%, CharXiv-D: 73.9%, MMMLU: 66.9%, Multi-IF: 57.2%.

Is Claude Opus 5 cheaper than GPT-4.1 nano?

GPT-4.1 nano is 50.0x cheaper for input tokens. Claude Opus 5 costs $5.00/M input and $25.00/M output via anthropic. GPT-4.1 nano costs $0.10/M input and $0.40/M output via openai.

What are the context window sizes for Claude Opus 5 and GPT-4.1 nano?

Claude Opus 5 supports 1.0M tokens and GPT-4.1 nano 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 Opus 5 and GPT-4.1 nano?

Key differences include context window (1.0M vs 1.0M), input pricing ($5.00 vs $0.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5 and GPT-4.1 nano?

Claude Opus 5 is developed by Anthropic and GPT-4.1 nano is developed by OpenAI.

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