ChatGPT-4o Latest vs Claude Opus 5.5
Claude Opus 5.5 leads the LLM Stats Score 59.8 to 24.9. ChatGPT-4o Latest is 1.8x cheaper per token.
OpenAI · Anthropic · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 59.8 to 24.9, ranking #1 overall.
On price, ChatGPT-4o Latest is roughly 1.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 5.5 also accepts a larger context window (1,000,000 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 ChatGPT-4o Latest
- cost matters — it's about 1.8x cheaper per token
Choose Claude Opus 5.5
- overall performance matters — it scores 59.8 and ranks #1 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
At a glance
The differences that matter most.
Individual benchmarks
1 reported for ChatGPT-4o Latest · 31 for Claude Opus 5.5
ChatGPT-4o Latest and Claude Opus 5.5don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, ChatGPT-4o Latest ($2.50/1M tokens) is 1.6x cheaper than Claude Opus 5.5 ($4.00/1M tokens).
For output processing, ChatGPT-4o Latest ($10.00/1M tokens) is 2.0x cheaper than Claude Opus 5.5 ($20.00/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than ChatGPT-4o Latest.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 5.5 accepts 1,000,000 input tokens compared to ChatGPT-4o Latest's 128,000 tokens. Claude Opus 5.5 can generate longer responses up to 128,000 tokens, while ChatGPT-4o Latest is limited to 16,384 tokens.
Input capabilities
Documented input modalities across available providers
Both ChatGPT-4o Latest and Claude Opus 5.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
ChatGPT-4o Latest
Claude Opus 5.5
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
ChatGPT-4o Latest was released on 2024-05-13, while Claude Opus 5.5 was released on 2026-09-22.
Claude Opus 5.5 is 29 months newer than ChatGPT-4o Latest.
May 13, 2024
2.4 years ago
Sep 22, 2026
0 days ago
2.4yr newerKnowledge Cutoff
When training data ends
Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while ChatGPT-4o Latest's cutoff date is not specified.
We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without ChatGPT-4o Latest's cutoff date.
—
Jun 2026
Provider Availability
ChatGPT-4o Latest is available from OpenAI. Claude Opus 5.5 is available from Anthropic.
ChatGPT-4o Latest
Claude Opus 5.5
Outputs Comparison
Judge for yourself.
Run your own prompts against ChatGPT-4o Latest and Claude Opus 5.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about ChatGPT-4o Latest vs Claude Opus 5.5.