Breaking

Unconfirmed Gemini 4 Pro Tests Show Reported Lead Over Google's Gemini 3.8 Flash

September 18, 2026 at 09:17 EDT

Foundation Models
AI Agents
Software Dev & Coding

Hands-on comparisons using the same SVG prompt have intensified speculation that an unconfirmed model being read as Gemini 4 Pro is a step beyond Google's official Gemini 3.8 Flash. Google has not confirmed Gemini 4 Pro, so the current picture is a mix of verified Gemini 3.8 Flash specifications and reported Arena test results.

Sep. 18, 2026 · Google Gemini

A suspected Gemini 4 Pro gap

Side-by-side SVG and artifact tests are being read as a large step beyond Gemini 3.8 Flash, but the model identity and benchmarks remain unconfirmed.

~88%

Reported DeepSWE v1.1

95.3%

Reported Terminal-bench

10M

Reported input tokens

Reported input price vs Flash

Input price, per 1M tokens

$0.75

Gemini 3.8 Flash

$2.25

Reported Gemini 4 Pro

The reported Pro input rate is exactly three stacked blocks to Flash's one.

Context window scale

1,048,576

Official Flash

10M

Reported Pro

The reported input window is about 9.5 times the official Flash limit.

Why developers care

The strongest examples center on SVG structure, 3D scenes, interactive websites and small games rather than ordinary chat answers.

Why caution remains

The benchmark figures, pricing and identity are circulating claims, not confirmed product specifications.

The live question

Same prompt->Cleaner artifact->Unconfirmed identity

The evidence points to a potentially larger flagship model, while the only confirmed product remains Gemini 3.8 Flash.

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