Claude Opus 4.5 vs GPT-5.4 nano Comparison

Comparing Claude Opus 4.5 and GPT-5.4 nano across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Opus 4.5 outperforms in 4 benchmarks (GPQA, MCP Atlas, Tau2 Telecom, Terminal-Bench 2.0), while GPT-5.4 nano is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Wed Mar 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.4 nano costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 25.0x more expensive than GPT-5.4 nano ($0.20/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 20.0x more expensive than GPT-5.4 nano ($1.25/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than GPT-5.4 nano.*

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

Lowest available price from all providers

Wed Mar 18 2026 • llm-stats.com

Claude Opus 4.5

Input tokens$5.00

Output tokens$25.00

Best providerAnthropic

GPT-5.4 nano

Input tokens$0.20

Output tokens$1.25

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.4 nano accepts 400,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. GPT-5.4 nano can generate longer responses up to 128,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.

Claude Opus 4.5

Input200,000 tokens

Output64,000 tokens

GPT-5.4 nano

Input400,000 tokens

Output128,000 tokens

Wed Mar 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and GPT-5.4 nano 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-5.4 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 4.5

Proprietary

Closed source

GPT-5.4 nano

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while GPT-5.4 nano was released on 2026-03-17.

GPT-5.4 nano is 4 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

3 months ago

GPT-5.4 nano

Mar 17, 2026

1 days ago

3mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a knowledge cutoff of 2025-03-31, while GPT-5.4 nano has a cutoff of 2025-08-31.

GPT-5.4 nano has more recent training data (up to 2025-08-31), making it potentially better informed about events through that date compared to Claude Opus 4.5 (2025-03-31).

Claude Opus 4.5

Mar 2025

GPT-5.4 nano

Aug 2025

5 mo newer

Provider Availability

Claude Opus 4.5 is available from Anthropic. GPT-5.4 nano is available from OpenAI. The availability of providers can affect quality of the model and reliability.