What is the difference between Claude Opus 4.8 and Gemini 3.5 Flash?

Claude Opus 4.8 is developed by Anthropic while Gemini 3.5 Flash is developed by Google AI. Claude Opus 4.8 has a 1.0M token context window vs Gemini 3.5 Flash's 1.0M. in 6 community votes on Rival, Gemini 3.5 Flash wins 67% 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 Gemini 3.5 Flash?

Based on 6 community votes on Rival, Gemini 3.5 Flash wins 67% of head-to-head matchups against Claude Opus 4.8.

How much does Claude Opus 4.8 cost compared to Gemini 3.5 Flash?

Claude Opus 4.8 costs $5/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. Gemini 3.5 Flash is $3.50/M cheaper per input. Gemini 3.5 Flash also wins more often in community votes, making it the better value.

How are Claude Opus 4.8 vs Gemini 3.5 Flash 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. 6 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

What is the difference between Claude Opus 4.8 and Gemini 3.5 Flash?

Claude Opus 4.8 is developed by Anthropic while Gemini 3.5 Flash is developed by Google AI. Claude Opus 4.8 has a 1.0M token context window vs Gemini 3.5 Flash's 1.0M. in 6 community votes on Rival, Gemini 3.5 Flash wins 67% 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 Gemini 3.5 Flash?

Based on 6 community votes on Rival, Gemini 3.5 Flash wins 67% of head-to-head matchups against Claude Opus 4.8.

How much does Claude Opus 4.8 cost compared to Gemini 3.5 Flash?

Claude Opus 4.8 costs $5/M input tokens and Gemini 3.5 Flash costs $1.5/M input tokens. Gemini 3.5 Flash is $3.50/M cheaper per input. Gemini 3.5 Flash also wins more often in community votes, making it the better value.

How are Claude Opus 4.8 vs Gemini 3.5 Flash 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. 6 votes have been collected for this pair across 54 challenges. All vote data is part of Rival's open dataset.

Claude Opus 4.8 vs Gemini 3.5 Flash: Which Is Better?

Updated May 2026

Our Verdict

Gemini 3.5 FlashWinner

Claude Opus 4.8Runner-up

Pick Gemini 3.5 Flash. In 6 blind votes, Gemini 3.5 Flash wins 67% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

Gemini 3.5 Flash

Input

$1.50

3.3× cheaper

Output

$9.00

2.8× cheaper

Gemini 3.5 Flash is cheaper on both — 3.3× input, 2.8× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

Gemini 3.5 Flash

60%Vocabulary59%

19wSentence Length18w

0.46Hedging0.16

4.7Bold4.4

3.2Lists3.0

0.78Emoji0.00

1.15Headings0.89

0.04Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.8 and Gemini 3.5 Flash have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 4.8 vs MiniMax M3New provider

Claude Opus 4.8 vs GPT-5New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider

Updated May 2026

Our Verdict

Gemini 3.5 FlashWinner

Claude Opus 4.8Runner-up

Pick Gemini 3.5 Flash. In 6 blind votes, Gemini 3.5 Flash wins 67% of the time. That's not luck.

Clear winner

API pricing

Cost per 1M tokens

Claude Opus 4.8

Input

$5.00

Output

$25.00

Gemini 3.5 Flash

Input

$1.50

3.3× cheaper

Output

$9.00

2.8× cheaper

Gemini 3.5 Flash is cheaper on both — 3.3× input, 2.8× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4.8 uses 77.6x more emoji

Claude Opus 4.8

Gemini 3.5 Flash

60%Vocabulary59%

19wSentence Length18w

0.46Hedging0.16

4.7Bold4.4

3.2Lists3.0

0.78Emoji0.00

1.15Headings0.89

0.04Transitions0.11

Based on 27 + 27 text responses

Research

What we learned reading every model

Claude Opus 4.8 and Gemini 3.5 Flash have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude Opus 4.8 vs MiniMax M3New provider

Claude Opus 4.8 vs GPT-5New provider

Claude Opus 4.8 vs Llama 4 MaverickNew provider