Claude 3 Opus vs GPT-4.5 Comparison

Comparing Claude 3 Opus and GPT-4.5 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude 3 Opus outperforms in 0 benchmarks, while GPT-4.5 is better at 4 benchmarks (GPQA, GSM8k, HumanEval, MMLU).

GPT-4.5 significantly outperforms across most benchmarks.

Mon Mar 16 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude 3 Opus costs less

For input processing, Claude 3 Opus ($15.00/1M tokens) is 5.0x cheaper than GPT-4.5 ($75.00/1M tokens).

For output processing, Claude 3 Opus ($75.00/1M tokens) is 2.0x cheaper than GPT-4.5 ($150.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than Claude 3 Opus.*

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

Lowest available price from all providers

Mon Mar 16 2026 • llm-stats.com

Claude 3 Opus

Input tokens$15.00

Output tokens$75.00

Best providerAnthropic

GPT-4.5

Input tokens$75.00

Output tokens$150.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Claude 3 Opus accepts 200,000 input tokens compared to GPT-4.5's 128,000 tokens. Claude 3 Opus can generate longer responses up to 200,000 tokens, while GPT-4.5 is limited to 4,096 tokens.

Claude 3 Opus

Input200,000 tokens

Output200,000 tokens

GPT-4.5

Input128,000 tokens

Output4,096 tokens

Mon Mar 16 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3 Opus and GPT-4.5 support multimodal inputs.

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

Claude 3 Opus

Text

Images

Audio

Video

GPT-4.5

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 3 Opus

Proprietary

Closed source

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3 Opus was released on 2024-02-29, while GPT-4.5 was released on 2025-02-27.

GPT-4.5 is 12 months newer than Claude 3 Opus.

Claude 3 Opus

Feb 29, 2024

2.0 years ago

GPT-4.5

Feb 27, 2025

1.0 years ago

12mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude 3 Opus is available from Anthropic, Bedrock, Google. GPT-4.5 is available from OpenAI. The availability of providers can affect quality of the model and reliability.