How do Claude Opus 5.5 and Gemini 3.5 Flash compare on coding benchmarks?

The comparison table shows SWE-bench, SWE-Pro, SWE-Atlas, Terminal-Bench, DeepSWE, and coding agent index scores for both Claude Opus 5.5 and Gemini 3.5 Flash when publicly disclosed.

LLM Comparison

Claude Opus 5.5 vs Gemini 3.5 Flash: benchmark scores, pricing & comparison.

Q: Which is better: Claude Opus 5.5 or Gemini 3.5 Flash?

AskClash compares Claude Opus 5.5 and Gemini 3.5 Flash side by side across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, AskClash ACB, and context window so you can see which model wins on each benchmark.

Side-by-side Claude Opus 5.5 vs Gemini 3.5 Flash comparison across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, context window, and AskClash RWT. Green marks the winner on each benchmark.

Open live leaderboard Claude Opus 5.5 model page Gemini 3.5 Flash model page

Rank #12 vs #29AskClash overall scores 64.5 vs 57.8.

Pricing $4.00/$20.0 vs $1.50/$9.00Input and output token prices per 1M tokens when published.

Proprietary vs ProprietaryAnthropic vs Google.

Claude Opus 5.5 vs Gemini 3.5 Flash benchmark comparison

Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.

Metric	Claude Opus 5.5	Gemini 3.5 Flash
Overall Score	64.5	57.8
Leaderboard Rank	#12	#29
ACB	61.7	—
RWT	—	7.0
HLE	67.7	40.2
GPQA	—	92.2
IFEval	—	76.3
SWE-Pro	89.9	55.1
Terminal-Bench	—	76.2
DeepSWE	74.2	36.1
GDPval-AA	1846.2	1184.8
OSWorld	—	78.4
MCP Atlas	—	83.6
Finance Agent	—	57.9
CharXiv	—	84.2
MMMU-Pro	87.7	83.6
ARC-AGI 2	—	72.1
Tau2	—	95.3
MRCR	—	77.3
Input Price (per 1M tokens)	$4.00	$1.50
Output Price (per 1M tokens)	$20.0	$9.00
Context Window	1M	1M
Benchmarks Published	7	16

Claude Opus 5.5 vs Gemini 3.5 Flash head-to-head charts

Claude Opus 5.5 leads 6 and Gemini 3.5 Flash leads 0 of 6 shared benchmarks. Gemini 3.5 Flash is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.

Claude Opus 5.5Gemini 3.5 Flash

Overall

64.5Claude Opus 5.5

57.8Gemini 3.5 Flash

HLE

67.7Claude Opus 5.5

40.2Gemini 3.5 Flash

SWE-Pro

89.9Claude Opus 5.5

55.1Gemini 3.5 Flash

DeepSWE

74.2Claude Opus 5.5

36.1Gemini 3.5 Flash

GDPval-AA

1846.2Claude Opus 5.5

1184.8Gemini 3.5 Flash

MMMU-Pro

87.7Claude Opus 5.5

83.6Gemini 3.5 Flash

Claude Opus 5.5

Input$4.00

Output$20.0

Workload$8.00

Context1M

Gemini 3.5 Flash

Input$1.50

Output$9.00

Workload$3.30

Context1M

Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.

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How to read this comparison

Benchmark scores

Higher is better for all benchmark scores (SWE-bench, GPQA, HLE, Terminal-Bench, etc.). Green marks the model with the higher score.

Token pricing

Lower is better for input and output prices. Green marks the cheaper model per 1M tokens.

Coverage matters

Models with fewer disclosed benchmark cells may have inflated percentile scores. Check the benchmark cell count for context.

This comparison page is generated from the AskClash LLM leaderboard cache. Open the live leaderboard for real-time scores and interactive filtering.