ChatGPT-4o Latest vs Claude Sonnet 5.5
Claude Sonnet 5.5 leads the LLM Stats Score 58.3 to 24.9. Claude Sonnet 5.5 is 1.1x cheaper per token.
OpenAI · Anthropic · Updated for 2026
Which is better?
Claude Sonnet 5.5 leads the overall LLM Stats Score 58.3 to 24.9, ranking #2 overall.
On price, Claude Sonnet 5.5 is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Sonnet 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
- you want predictable pricing at $2.50/M input and $10.00/M output
Choose Claude Sonnet 5.5
- overall performance matters — it scores 58.3 and ranks #2 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- cost matters — it's about 1.1x cheaper per token
- 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 · 47 for Claude Sonnet 5.5
ChatGPT-4o Latest and Claude Sonnet 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 1.3x more expensive than Claude Sonnet 5.5 ($2.00/1M tokens).
For output processing, ChatGPT-4o Latest ($10.00/1M tokens) costs the same as Claude Sonnet 5.5 ($10.00/1M tokens).
In conclusion, ChatGPT-4o Latest is more expensive than Claude Sonnet 5.5.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Sonnet 5.5 accepts 1,000,000 input tokens compared to ChatGPT-4o Latest's 128,000 tokens. Claude Sonnet 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 Sonnet 5.5 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
ChatGPT-4o Latest
Claude Sonnet 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 Sonnet 5.5 was released on 2026-09-28.
Claude Sonnet 5.5 is 29 months newer than ChatGPT-4o Latest.
May 13, 2024
2.4 years ago
Sep 28, 2026
1 weeks ago
2.4yr newerKnowledge Cutoff
When training data ends
Claude Sonnet 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 Sonnet 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 Sonnet 5.5 is available from Anthropic.
ChatGPT-4o Latest
Claude Sonnet 5.5
Outputs Comparison
Judge for yourself.
Run your own prompts against ChatGPT-4o Latest and Claude Sonnet 5.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about ChatGPT-4o Latest vs Claude Sonnet 5.5.