The AI arena is free today

Open Superagent

Claude Opus 5 vs Gemini 3 Flash

Claude Opus 5 leads the LLM Stats Score 54.9 to 36.9. Gemini 3 Flash is 8.9x cheaper per token.

Anthropic · Google · Updated for 2026

Which is better?

Claude Opus 5 leads the overall LLM Stats Score 54.9 to 36.9, ranking #5 overall.

In the 2 individual benchmarks reported for both models, Claude Opus 5 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 3 Flash is roughly 8.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Opus 5

  • overall performance matters — it scores 54.9 and ranks #5 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you want the most recent training data — it shipped Jul 2026

Choose Gemini 3 Flash

  • cost matters — it's about 8.9x cheaper per token

At a glance

The differences that matter most.

Claude Opus 5
Anthropic
Gemini 3 Flash
Google
Core performance indexes
LLM Stats Score
54.9
#5
36.9
#72
Reasoning
53.9
#4
37.6
#64
Coding
41.9
#9
22.4
#79
Agents
40.0
#7
17.9
#71
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$5.00 / M
$0.50 / M
Output price
$25.00 / M
$3.00 / M
Context window
1,000,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Opus 5
Gemini 3 Flash
Vision
37.9#4
25.5#44
Tool use
27.9#21
15.9#86
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

13 reported for Claude Opus 5 · 24 for Gemini 3 Flash

2 shared

Claude Opus 5 outperforms in 2 benchmarks (Humanity's Last Exam, Legal Agent Benchmark), while Gemini 3 Flash is better at 0 benchmarks.

Claude Opus 5 significantly outperforms across most benchmarks.

Sun Sep 13 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 3 Flash costs less

For input processing, Claude Opus 5 ($5.00/1M tokens) is 10.0x more expensive than Gemini 3 Flash ($0.50/1M tokens).

For output processing, Claude Opus 5 ($25.00/1M tokens) is 8.3x more expensive than Gemini 3 Flash ($3.00/1M tokens).

In conclusion, Claude Opus 5 is more expensive than Gemini 3 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Sep 13 2026 • llm-stats.com
Anthropic
Claude Opus 5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Google
Gemini 3 Flash
Input tokens$0.50
Output tokens$3.00
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,000,000 tokens. Claude Opus 5 can generate longer responses up to 128,000 tokens, while Gemini 3 Flash is limited to 65,536 tokens.

Anthropic
Claude Opus 5
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
Sun Sep 13 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Opus 5 and Gemini 3 Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 5

Text
Images
Audio
Video

Gemini 3 Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Opus 5

Proprietary

Closed source

Gemini 3 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 5 was released on 2026-07-24, while Gemini 3 Flash was released on 2025-12-17.

Claude Opus 5 is 7 months newer than Gemini 3 Flash.

Claude Opus 5

Jul 24, 2026

1 months ago

7mo newer
Gemini 3 Flash

Dec 17, 2025

9 months ago

Knowledge Cutoff

When training data ends

Gemini 3 Flash has a documented knowledge cutoff of 2025-01-31, while Claude Opus 5's cutoff date is not specified.

We can confirm Gemini 3 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without Claude Opus 5's cutoff date.

Claude Opus 5

—

Gemini 3 Flash

Jan 2025

Provider Availability

Claude Opus 5 is available from Anthropic, DeepInfra. Gemini 3 Flash is available from Google.

Claude Opus 5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M
deepinfra logo
Deepinfra
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

Gemini 3 Flash

google logo
Google
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Opus 5 and Gemini 3 Flash side-by-side, then vote on the output you prefer.

Claude Opus 5
✓ Preferred
Gemini 3 Flash
Open in Playground

FAQ

Common questions about Claude Opus 5 vs Gemini 3 Flash.

Which is better, Claude Opus 5 or Gemini 3 Flash?

Claude Opus 5 leads the LLM Stats Score 54.9 to 36.9. Claude Opus 5 is made by Anthropic and Gemini 3 Flash is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 5 compare to Gemini 3 Flash in benchmarks?

Claude Opus 5 scores BrowseComp: 90.8%, BioMysteryBench: 90.1%, OSWorld 2.0: 70.6%, DeepSWE 1.1: 68.8%, Humanity's Last Exam: 64.7%. Gemini 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%.

Is Claude Opus 5 cheaper than Gemini 3 Flash?

Gemini 3 Flash is 10.0x cheaper for input tokens. Claude Opus 5 costs $5.00/M input and $25.00/M output via anthropic. Gemini 3 Flash costs $0.50/M input and $3.00/M output via google.

What are the context window sizes for Claude Opus 5 and Gemini 3 Flash?

Claude Opus 5 supports 1.0M tokens and Gemini 3 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 5 and Gemini 3 Flash?

Key differences include LLM Stats Score (54.9 vs 36.9), input pricing ($5.00 vs $0.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 5 and Gemini 3 Flash?

Claude Opus 5 is developed by Anthropic and Gemini 3 Flash is developed by Google.

Related comparisons