Claude 3 Opus vs GPT-4.5
GPT-4.5 leads the LLM Stats Score 20.5 to 10.4. Claude 3 Opus is 3.1x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
GPT-4.5 leads the overall LLM Stats Score 20.5 to 10.4, ranking #179 overall.
In the 4 individual benchmarks reported for both models, GPT-4.5 wins 4; this is a narrower head-to-head signal than the composite indexes.
On price, Claude 3 Opus is roughly 3.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude 3 Opus also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude 3 Opus
- cost matters — it's about 3.1x cheaper per token
- you process long inputs — it offers a 200,000 token context window
Choose GPT-4.5
- overall performance matters — it scores 20.5 and ranks #179 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 4 of 4 exact shared results
- you want the most recent training data — it shipped Feb 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
11 reported for Claude 3 Opus · 26 for GPT-4.5
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.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
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
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.
Input capabilities
Documented input modalities across available providers
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
GPT-4.5
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
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.
Feb 29, 2024
2.5 years ago
Feb 27, 2025
1.5 years ago
12mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude 3 Opus is available from Anthropic, Bedrock, Google. GPT-4.5 is available from OpenAI.
Claude 3 Opus
GPT-4.5
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude 3 Opus and GPT-4.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude 3 Opus vs GPT-4.5.