Claude Opus 4.5 vs GPT-5 High
Claude Opus 4.5 and GPT-5 High are closely matched at 38.2 and 34.0 on the LLM Stats Score. GPT-5 High is 2.9x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Opus 4.5 and GPT-5 High are closely matched on the overall LLM Stats Score at 38.2 and 34.0.
In the 1 individual benchmarks reported for both models, GPT-5 High wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-5 High is roughly 2.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5 High also accepts a larger context window (400,000 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 Opus 4.5
- you want the most recent training data — it shipped Nov 2025
Choose GPT-5 High
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 2.9x cheaper per token
- you process long inputs — it offers a 400,000 token context window
At a glance
The differences that matter most.
Individual benchmarks
11 reported for Claude Opus 4.5 · 2 for GPT-5 High
Claude Opus 4.5 outperforms in 0 benchmarks, while GPT-5 High is better at 1 benchmark (GPQA).
GPT-5 High 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 Opus 4.5 ($5.00/1M tokens) is 4.0x more expensive than GPT-5 High ($1.25/1M tokens).
For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 2.5x more expensive than GPT-5 High ($10.00/1M tokens).
In conclusion, Claude Opus 4.5 is more expensive than GPT-5 High.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5 High accepts 400,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. GPT-5 High can generate longer responses up to 128,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 4.5 and GPT-5 High support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 4.5
GPT-5 High
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 Opus 4.5 was released on 2025-11-24, while GPT-5 High was released on 2025-08-07.
Claude Opus 4.5 is 4 months newer than GPT-5 High.
Nov 24, 2025
10 months ago
3mo newerAug 7, 2025
1.1 years ago
Knowledge Cutoff
When training data ends
Claude Opus 4.5 has a knowledge cutoff of 2025-03-31, while GPT-5 High has a cutoff of 2024-09-30.
Claude Opus 4.5 has more recent training data (up to 2025-03-31), making it potentially better informed about events through that date compared to GPT-5 High (2024-09-30).
Mar 2025
6 mo newerSep 2024
Provider Availability
Claude Opus 4.5 is available from Anthropic. GPT-5 High is available from OpenAI.
Claude Opus 4.5
GPT-5 High
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 4.5 and GPT-5 High side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 4.5 vs GPT-5 High.