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Gemini 2.5 Flash vs Gemini 4 Argon

Gemini 4 Argon leads the LLM Stats Score 55.1 to 21.7.

Google · Google · Updated for 2026

Which is better?

Gemini 4 Argon leads the overall LLM Stats Score 55.1 to 21.7, ranking #4 overall.

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

Choose Gemini 2.5 Flash

  • you want predictable pricing at $0.30/M input and $2.50/M output

Choose Gemini 4 Argon

  • overall performance matters — it scores 55.1 and ranks #4 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Gemini 2.5 Flash
Google
Gemini 4 Argon
Google
Core performance indexes
LLM Stats Score
21.7
#199
55.1
#4
Reasoning
21.4
#196
52.4
#7
Coding
8.3
#194
44.1
#4
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.30 / M
— / M
Output price
$2.50 / M
— / M
Context window
1,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Gemini 2.5 Flash
Gemini 4 Argon
Vision
10.9#122
36.8#8
Long context
6.2#101
30.6#3
Multimodal
19.5#80
36.9#8
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

14 reported for Gemini 2.5 Flash · 19 for Gemini 4 Argon

No common benchmarks found

Gemini 2.5 Flash and Gemini 4 Argondon'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

Context Window

Maximum input and output token capacity

Only Gemini 2.5 Flash specifies input context (1,000,000 tokens). Only Gemini 2.5 Flash specifies output context (1,000,000 tokens).

Google
Gemini 2.5 Flash
Input1,000,000 tokens
Output1,000,000 tokens
Google
Gemini 4 Argon
Input- tokens
Output- tokens
Thu Oct 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 2.5 Flash and Gemini 4 Argon support multimodal inputs.

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

Gemini 2.5 Flash

Text
Images
Audio
Video

Gemini 4 Argon

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.

Gemini 2.5 Flash

Proprietary

Closed source

Gemini 4 Argon

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while Gemini 4 Argon was released on 2026-09-30.

Gemini 4 Argon is 17 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

1.4 years ago

Gemini 4 Argon

Sep 30, 2026

1 weeks ago

1.4yr newer

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash has a documented knowledge cutoff of 2025-01-31, while Gemini 4 Argon's cutoff date is not specified.

We can confirm Gemini 2.5 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without Gemini 4 Argon's cutoff date.

Gemini 2.5 Flash

Jan 2025

Gemini 4 Argon

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 2.5 Flash and Gemini 4 Argon side-by-side, then vote on the output you prefer.

Gemini 2.5 Flash
✓ Preferred
Gemini 4 Argon
Open in Playground

FAQ

Common questions about Gemini 2.5 Flash vs Gemini 4 Argon.

Which is better, Gemini 2.5 Flash or Gemini 4 Argon?

Gemini 4 Argon leads the LLM Stats Score 55.1 to 21.7. Gemini 2.5 Flash is made by Google and Gemini 4 Argon is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 2.5 Flash compare to Gemini 4 Argon in benchmarks?

Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%. Gemini 4 Argon scores Graphwalks BFS <128k: 99.7%, Vibe Code Bench: 91.9%, LVBench: 91.7%, LABBench2: 88.8%, Graphwalks BFS >128k: 84.2%.

What are the context window sizes for Gemini 2.5 Flash and Gemini 4 Argon?

Gemini 2.5 Flash supports 1.0M tokens and Gemini 4 Argon supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 2.5 Flash and Gemini 4 Argon?

Key differences include LLM Stats Score (21.7 vs 55.1). See the full comparison above for benchmark-by-benchmark results.

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