What is the difference between Claude Opus 4.8 and GPT-5.5?

Claude Opus 4.8 is developed by Anthropic while GPT-5.5 is developed by OpenAI. Claude Opus 4.8 has a 1.0M token context window vs GPT-5.5's 1.1M. in 51 community votes on Rival, Claude Opus 4.8 wins 63% of head-to-head matchups. These results are based on blind head-to-head voting across 54 challenges.

Which is better, Claude Opus 4.8 or GPT-5.5?

Based on 51 community votes on Rival, Claude Opus 4.8 wins 63% of head-to-head matchups against GPT-5.5. Claude Opus 4.8 is strongest in Image Generation, Reasoning.

How much does Claude Opus 4.8 cost compared to GPT-5.5?

Claude Opus 4.8 costs $5/M input tokens and GPT-5.5 costs $5/M input tokens. GPT-5.5 is $0.00/M cheaper per input. The more expensive model wins 63% of duels, so the premium may be justified by quality.

How are Claude Opus 4.8 vs GPT-5.5 votes collected on Rival?

Rival presents both models' outputs side-by-side in blind duels. Voters see the responses but don't know which model produced each one, eliminating brand bias. 51 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

Updated May 2026

Claude Opus 4.8vsGPT-5.5

Claude Opus 4.8 wins 63% of 51 blind community votes against GPT-5.5 on Rival.

Claude Opus 4.8 and GPT-5.5 compared across 54 shared prompts
Spec	Claude Opus 4.8	GPT-5.5
Win rate	63%	37%
Input price	$5/M tokens	$5/M tokens
Output price	$25/M tokens	$30/M tokens
Context window	1.0M tokens	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2026	Apr 2026