ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Grok 4.6 vs Gemini 3.5 Flash

Gemini 3.5 Flash comes out ahead, 69 to 65 on our weighted score, though Grok 4.6 is 11% cheaper per token.

  1. xAI

    Grok 4.6

    Released Aug 12, 2026

    65/100
    • ECI156.6
    • Price$2.00 / $6.00
    • Context500K
    Full specs Remove Grok 4.6
  2. Our pick

    Google

    Gemini 3.5 Flash

    Released May 19, 2026

    69/100
    • ECI154.5
    • Price$1.50 / $9.00
    • Context1.05M
    Full specs Remove Gemini 3.5 Flash

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 3.5 Flash is our pick

Gemini 3.5 Flash is the better all-round choice, scoring 69/100 against Grok 4.6 (65). It leads on inputs & features and context window. Grok 4.6 wins on capability and price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGrok 4.6Capabilities Index (ECI): Grok 4.6 156.6 · Gemini 3.5 Flash 154.5
  • Lowest priceGrok 4.6Grok 4.6 $3.00 · Gemini 3.5 Flash $3.38 per 1M tokens (3:1 blend)
  • Longest contextGemini 3.5 FlashGemini 3.5 Flash 1,048,576 · Grok 4.6 500,000 tokens
  • Widest inputsGemini 3.5 FlashGrok 4.6: Text, Images · Gemini 3.5 Flash: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGrok 4.6Gemini 3.5 Flash
CapabilityCapabilities Index (ECI)50%8684
Price25%2725
Inputs & features15%70100
Context window10%4861
Overall100%65/10069/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Grok 4.6 vs Gemini 3.5 Flash specifications side by side
SpecificationGrok 4.6xAIGemini 3.5 FlashGoogle
Capability
Capabilities Index (ECI)156.6 (best)154.5
ECI rank#19 of 148 (best)#33 of 148
GPQA DiamondGraduate-level science questions94.0% (best)92.8%
FrontierMath Tiers 1–3Research-level mathematics66.0% (best)62.8%
OTIS Mock AIME 2024–2025Competition mathematics99.2% (best)95.6%
SWE-bench VerifiedFixing real GitHub issues—79.3%
SimpleQA VerifiedShort factual questions49.3%66.2% (best)
Price per million tokens
Input$2.00$1.50 (best)
Output$6.00 (best)$9.00
Cached input$0.50$0.15 (best)
Blended (3:1)$3.00 (best)$3.38
Long-context rateOver 200K: $4.00 / $12.00Same rate
Price sourceOfficial xAI APIOfficial Google API
Limits
Context window500,000 tokens1,048,576 tokens (best)
Max output500,000 tokens (best)65,536 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoYes
VideoNoYes
ReasoningYeslow · medium · high · xhighYesminimal · low · medium · high
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgrok-4.6gemini-3.5-flash
API providers2932 (best)
ReleasedAug 12, 2026May 19, 2026
Knowledge cutoffFeb 1, 2026Jan 2025
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Grok 4.6$32.00
  • Gemini 3.5 Flash$33.00
04 — Questions

Which should you choose?

Which is better: Grok 4.6 or Gemini 3.5 Flash?

Gemini 3.5 Flash is the better all-round choice, scoring 69/100 against Grok 4.6 (65). It leads on inputs & features and context window. Grok 4.6 wins on capability and price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Grok 4.6 or Gemini 3.5 Flash?

Grok 4.6 is cheaper at $2.00 input / $6.00 output per million tokens (official xAI API price). Gemini 3.5 Flash costs $1.50 input / $9.00 output per million tokens (official Google API price). At a typical mix of three input tokens to one output token, that is $3.00 per million tokens for Grok 4.6 versus $3.38 for Gemini 3.5 Flash (1.1× as much).

Which scores higher on benchmarks?

Grok 4.6 scores higher on the Capabilities Index (ECI): Grok 4.6 156.6 (#19 of 148) and Gemini 3.5 Flash 154.5 (#33 of 148). The confidence ranges of the top two overlap (154.7–158.9 vs 152.5–156.6), so treat the gap as small. On individual benchmarks: GPQA Diamond — Grok 4.6 94.0%, Gemini 3.5 Flash 92.8%; FrontierMath Tiers 1–3 — Grok 4.6 66.0%, Gemini 3.5 Flash 62.8%; OTIS Mock AIME 2024–2025 — Grok 4.6 99.2%, Gemini 3.5 Flash 95.6%; SimpleQA Verified — Gemini 3.5 Flash 66.2%, Grok 4.6 49.3%.

Which is better for coding?

There are no published SWE-bench Verified results for Grok 4.6 yet, so there is no like-for-like coding score. On overall capability, Grok 4.6 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemini 3.5 Flash has the largest context window at 1,048,576 tokens, against 500,000 for Grok 4.6. Maximum output per response: Grok 4.6 up to 500,000, Gemini 3.5 Flash up to 65,536 tokens.

Which can read images, PDFs, audio or video?

Grok 4.6 accepts text and images; Gemini 3.5 Flash accepts text, images, PDFs, audio and video. Gemini 3.5 Flash handles the widest range of inputs.

Are any of these open source?

No. Grok 4.6 and Gemini 3.5 Flash are proprietary and only available through APIs and apps.

Which is newer?

Grok 4.6 is the newest, released Aug 12, 2026. Gemini 3.5 Flash came out May 19, 2026. Knowledge cutoff: Grok 4.6 Feb 1, 2026, Gemini 3.5 Flash Jan 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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