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Gemini 3 Flash vs Grok 4.5

Updated October 7, 2026. Rank says Grok 4.5 is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.

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Decision reading

Grok 4.5 has the higher public score estimate, 63.97 versus 54.55, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 5 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.

Model A
Google logo

Google

54.55/100

Supported · Public rank #62

90% interval 39.7–69.4

Model B
xAI logo

xAI

63.97/100

Supported · Public rank #39

90% interval 59.2–68.8

Shared results
5
Gemini 3 Flash only
6
Grok 4.5 only
12
Like-for-like categories
3 / 8
Supported: Gemini 3 Flash and Grok 4.5How the comparison works

Which one for your work

Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.

  • Coding work

    Code generation, repair, and software-engineering tasks

    Grok 4.5

    Grok 4.5 has the higher public coding point estimate, 57.7 to 34.2, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

    Confidence: limited
  • Agentic work

    Tool use, computer use, and multi-step task completion

    Grok 4.5

    Grok 4.5 has the higher public agentic point estimate, 57.6 to 31.4, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

    Confidence: limited
  • Long documents

    Prompts that approach the documented context limit

    Gemini 3 Flash

    Gemini 3 Flash has the larger documented context window.

    Confidence: documented
Show secondary and unsupported calls
  • Chat turn cost

    1K fresh input + 500 output tokens

    Gemini 3 Flash

    Gemini 3 Flash has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates
  • Cache-heavy agent loop cost

    200K cached + 20K fresh input + 10K output tokens

    Gemini 3 Flash

    Gemini 3 Flash has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates
  • Repository review cost

    50K fresh input + 3K output tokens

    Gemini 3 Flash

    Gemini 3 Flash has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates

Which one for a specific job

Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.

The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.

34.2Gemini 3 Flash57.7Grok 4.5

Like-for-like · BenchAlign v5.8

Grok 4.5 has the higher coding point estimate. Conditional score ranges do not establish rank confidence.

Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.

Same basis rules as the category table below

What is actually comparable

Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.

Shape of the matched evidence

Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.

Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.

Bars run 0–100 on each benchmark’s normalized display scale

Category results, on a stated basis

Each row shows the public-lane category score for both models: the BenchAlign v5.8 lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.

Agentic

Like-for-like
Gemini 3 Flash
31.4
Supported · #82/122
Grok 4.5
57.6
Supported · #29/122
Basis
BenchAlign v5.8 lane · 4 vs 4 public rows
Reading
Grok 4.5 leads

Coding

Like-for-like
Gemini 3 Flash
34.2
Supported · #85/146
Grok 4.5
57.7
Supported · #27/146
Basis
BenchAlign v5.8 lane · 3 vs 8 public rows
Reading
Grok 4.5 leads

Knowledge

Like-for-like
Gemini 3 Flash
53.6
Supported · #57/174
Grok 4.5
67.0
Supported · #19/174
Basis
BenchAlign v5.8 lane · 2 vs 2 public rows
Reading
Grok 4.5 leads · intervals overlap

Reasoning

Not comparable
Gemini 3 Flash
60.3
Unranked · 2 rankable rows
Grok 4.5
50.4
#28/28
Basis
Provisional lane · 0 vs 2 weighted rows
Reading
Not comparable

Multimodal

Not comparable
Gemini 3 Flash
76.9
Unranked · 1 rankable row
Grok 4.5
79.5
Unranked · 1 rankable row
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Multilingual

Not comparable
Gemini 3 Flash
Not ranked
Grok 4.5
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Instruction following

Not comparable
Gemini 3 Flash
64.7
#70/125
Grok 4.5
Not ranked
Basis
Provisional lane · 0 vs 0 weighted rows
Reading
Not comparable

Math

Not comparable
Gemini 3 Flash
50.0
Unranked · 2 rankable rows
Grok 4.5
Not ranked
Basis
Provisional lane · 2 vs 0 weighted rows
Reading
Not comparable

Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.8) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.

Supported evidence per lane · bars run 0–100Methodology

What each workload costs

Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.

Chat turn

1K fresh input + 500 output tokens

Gemini 3 Flash
$0.002
Fits in one request
Grok 4.5
$0.005
Fits in one request

Gemini 3 Flash has the lower modeled cost

Costs use the listed standard API rates.

Repository review

50K fresh input + 3K output tokens

Gemini 3 Flash
$0.034
Fits in one request
Grok 4.5
$0.118
Fits in one request

Gemini 3 Flash has the lower modeled cost

Costs use the listed standard API rates.

Cache-heavy agent loop

200K cached + 20K fresh input + 10K output tokens

Gemini 3 Flash
$0.05
Fits in one request
Grok 4.5
$0.16
Fits in one request

Gemini 3 Flash has the lower modeled cost

Costs use the listed standard API rates.

Cached input falls back to the list input rate only where a cached rate is unpublished

Specification differences

Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.

Context window

Maximum documented context; output-token limits may be lower.

Grok 4.5

500K

Cached-input rate

A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.

Gemini 3 Flash

$0.05 per 1M cached input tokens

Google Gemini API pricing

Grok 4.5

$0.3 per 1M cached input tokens

Documented inputs

Gemini 3 Flash

Not sourced

Grok 4.5

Not sourced

Documented outputs

Gemini 3 Flash

Not sourced

Grok 4.5

Not sourced

Provider availability

Gemini 3 Flash

Not sourced

Grok 4.5

Not sourced

Reasoning profile

Gemini 3 Flash

Non-Reasoning

Grok 4.5

Reasoning

Weight access

Gemini 3 Flash

Proprietary

Grok 4.5

Proprietary

License

Gemini 3 Flash

Proprietary

Grok 4.5

Proprietary

Release date

Gemini 3 Flash

2025-12-01

Grok 4.5

2026-07-08

If you already use one of these models

Deployment change
The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
Quality signal
Grok 4.5 has the higher public score estimate, 63.97 versus 54.55, but the 90% score intervals overlap.
Workload cost
Repository review: $0.034 vs $0.118. Cache-heavy agent loop: $0.05 vs $0.16.
Context tradeoff
Gemini 3 Flash has the larger documented window (1M).
Run the same representative tasks against both endpoints before changing production traffic.

Questions

Which is better, Gemini 3 Flash or Grok 4.5?

Grok 4.5 has the higher public score estimate, 63.97 versus 54.55, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.

Which is better for coding, Gemini 3 Flash or Grok 4.5?

Grok 4.5 has the higher public coding point estimate, 57.7 to 34.2, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

Which is better for agentic tasks, Gemini 3 Flash or Grok 4.5?

Grok 4.5 has the higher public agentic tasks point estimate, 57.6 to 31.4, with Supported evidence for both models. The conditional ranges do not establish rank confidence.

Which costs less, Gemini 3 Flash or Grok 4.5?

For the stated presets, chat costs $0.002 on Gemini 3 Flash and $0.005 on Grok 4.5; repository review costs $0.034 and $0.118; the cache-heavy agent loop costs $0.05 and $0.16. Costs use the listed standard API rates.

Which has the larger context window, Gemini 3 Flash or Grok 4.5?

Gemini 3 Flash has the larger documented context window: 1M, compared with 500K.

Benchmark evidence

The full public result ledger is available for audit without forcing a wide desktop table onto a phone.

Browse raw public benchmark evidence23 rows

Agentic

  • Claw-Eval

    Gemini 3 Flash49.2%
    Source
    Grok 4.5—

    Not directly comparable

  • Gert Labs

    Gemini 3 Flash56.63%
    Source
    Grok 4.5—

    Not directly comparable

  • JobBench

    Gemini 3 Flash11.4%
    Source
    Grok 4.5—

    Not directly comparable

  • Terminal-Bench 2.1 (Vals)

    Gemini 3 Flash53.9%
    Source
    Grok 4.567.8%
    Source

    Grok 4.5 leads this result

  • Terminal-Bench 3.0

    Gemini 3 Flash—
    Grok 4.515.7%
    Source

    Not directly comparable

  • Terminal-Bench 2.1

    Gemini 3 Flash—
    Grok 4.583.3%
    Source

    Not directly comparable

  • deepSwe

    Gemini 3 Flash—
    Grok 4.553%
    Source

    Not directly comparable

Coding

  • Vibe Code Bench

    Gemini 3 Flash20.20%
    Source
    Grok 4.5—

    Not directly comparable

  • LiveCodeBench (Vals)

    Gemini 3 Flash85.6%
    Source
    Grok 4.587.4%
    Source

    Grok 4.5 leads this result

  • SWE-bench (Vals)

    Gemini 3 Flash75.0%
    Source
    Grok 4.586.6%
    Source

    Grok 4.5 leads this result

  • SWE-bench Pro

    Gemini 3 Flash—
    Grok 4.564.7%
    Source

    Not directly comparable

  • SWE Multilingual

    Gemini 3 Flash—
    Grok 4.578%
    Source

    Not directly comparable

  • Terminal-Bench 2.1

    Gemini 3 Flash—
    Grok 4.583.3%
    Source

    Not directly comparable

  • CursorBench 3.2

    Gemini 3 Flash—
    Grok 4.566.7%
    Source

    Not directly comparable

  • VulcanBench v3

    Gemini 3 Flash—
    Grok 4.589.9%
    Source

    Not directly comparable

  • PostTrainBench v1.1

    Gemini 3 Flash—
    Grok 4.523.4%
    Source

    Not directly comparable

Reasoning

  • ARC-AGI-2

    Gemini 3 Flash—
    Grok 4.552.6%
    Source

    Not directly comparable

  • ARC-AGI-3

    Gemini 3 Flash—
    Grok 4.50.3%
    Source

    Not directly comparable

  • ARC-AGI-1

    Gemini 3 Flash—
    Grok 4.585.67%
    Source

    Not directly comparable

Knowledge

  • GPQA Diamond (Vals)

    Gemini 3 Flash87.9%
    Source
    Grok 4.592.9%
    Source

    Grok 4.5 leads this result

  • MMLU-Pro (Vals)

    Gemini 3 Flash88.6%
    Source
    Grok 4.589.2%
    Source

    Grok 4.5 leads this result

Math

  • FrontierMath v2 (Tiers 1-3)

    Gemini 3 Flash35.640%
    Source
    Grok 4.5—

    Not directly comparable

  • FrontierMath v2 (Tier 4)

    Gemini 3 Flash4.167%
    Source
    Grok 4.5—

    Not directly comparable

23 public results · 5 shared

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Last updated October 7, 2026