Claude Opus 4.5 vs GPT-5.4 mini Comparison

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

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Opus 4.5 outperforms in 2 benchmarks (MCP Atlas, Tau2 Telecom), while GPT-5.4 mini is better at 2 benchmarks (GPQA, Terminal-Bench 2.0).

Both models are evenly matched across the benchmarks.

Wed Mar 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.4 mini costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 6.7x more expensive than GPT-5.4 mini ($0.75/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 5.6x more expensive than GPT-5.4 mini ($4.50/1M tokens).

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

* 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 mini

Input tokens$0.75

Output tokens$4.50

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.4 mini accepts 400,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. GPT-5.4 mini 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 mini

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 mini 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 mini

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 mini

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Claude Opus 4.5

Nov 24, 2025

3 months ago

GPT-5.4 mini

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 mini has a cutoff of 2025-08-31.

GPT-5.4 mini 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 mini

Aug 2025

5 mo newer

Provider Availability

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