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Model comparison

Grok 4.3 vs Kimi K2.5 (Reasoning)

Updated July 30, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.

Grok 4.3

xAI

64.2/100

Supported · Public rank #36

90% interval 54.5–74.0

Kimi K2.5 (Reasoning)

Moonshot AI

58.5/100

Estimated · Public rank #64

90% interval 47.0–70.0

Grok 4.3 has the higher public score estimate, 64.2 versus 58.53, but the 90% score intervals overlap. Treat that as a lead, not a settled winner.

1 results are shared. Category rows based on different benchmark sets are marked directional and do not name a winner.

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.

  • Long documents

    Prompts that approach the documented context limit

    Grok 4.3

    Grok 4.3 has the larger documented context window.

    Confidence: documented

  • Chat turn cost

    1K fresh input + 500 output tokens

    Kimi K2.5 (Reasoning)

    Kimi K2.5 (Reasoning) 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

    Grok 4.3

    Grok 4.3 has the lower estimated token cost for this stated workload. Kimi K2.5 (Reasoning) has no published cached-input rate, so cached tokens use its listed input rate.

    Confidence: rate-fallback

Show secondary and unsupported calls

  • Repository review cost

    50K fresh input + 3K output tokens

    Kimi K2.5 (Reasoning)

    Kimi K2.5 (Reasoning) has the lower estimated token cost for this stated workload. Costs use the listed standard API rates.

    Confidence: listed-rates

  • Coding work

    Code generation, repair, and software-engineering tasks

    Not enough matched evidence

    No shared weighted benchmark basis supports a winner.

    Confidence: limited

  • Agentic work

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

    Not enough matched evidence

    No shared weighted benchmark basis supports a winner.

    Confidence: limited

What is actually comparable

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

Shared results
1
Grok 4.3 only
1
Kimi K2.5 (Reasoning) only
8
Like-for-like categories
0 / 8

Category results, on a stated basis

Each row states whether both averages use the same weighted benchmark set. Directional and not-comparable rows remain visible, but they never receive a winner in this template.

Agentic

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
55.0
Weighted basis
0 vs 2 rows
Reading
Not comparable

Coding

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
76.8
Weighted basis
0 vs 1 rows
Reading
Not comparable

Reasoning

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
Not measured
Weighted basis
0 vs 0 rows
Reading
Not comparable

Knowledge

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
87.2
Weighted basis
0 vs 2 rows
Reading
Not comparable

Math

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
Not measured
Weighted basis
0 vs 0 rows
Reading
Not comparable

Multilingual

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
Not measured
Weighted basis
0 vs 0 rows
Reading
Not comparable

Multimodal

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
78.5
Weighted basis
0 vs 1 rows
Reading
Not comparable

Instruction following

Not comparable
Grok 4.3
Not measured
Kimi K2.5 (Reasoning)
Not measured
Weighted basis
0 vs 0 rows
Reading
Not comparable

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.

A shared-evidence shape is not available.

BenchLM does not draw a radar or infer missing axes when the matched evidence is too sparse.

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

Grok 4.3
$0.0025
Fits in one request
Kimi K2.5 (Reasoning)
$0.0021
Fits in one request

Kimi K2.5 (Reasoning) has the lower modeled cost

Costs use the listed standard API rates.

Repository review

50K fresh input + 3K output tokens

Grok 4.3
$0.07
Fits in one request
Kimi K2.5 (Reasoning)
$0.039
Fits in one request

Kimi K2.5 (Reasoning) has the lower modeled cost

Costs use the listed standard API rates.

Cache-heavy agent loop

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

Grok 4.3
$0.09
Fits in one request
Kimi K2.5 (Reasoning)
$0.162
Fits in one request
Cached input priced at the published list-input rate

Grok 4.3 has the lower modeled cost

Kimi K2.5 (Reasoning) has no published cached-input rate, so cached tokens use its listed input rate.

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 4.3

1M

Kimi K2.5 (Reasoning)

256K

API model ID

Grok 4.3

Not sourced

Kimi K2.5 (Reasoning)

Not sourced

Cached-input rate

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

Grok 4.3

$0.2 per 1M cached input tokens

Kimi K2.5 (Reasoning)

Not published

Documented inputs

Grok 4.3

Not sourced

Kimi K2.5 (Reasoning)

Not sourced

Documented outputs

Grok 4.3

Not sourced

Kimi K2.5 (Reasoning)

Not sourced

Provider availability

Grok 4.3

Not sourced

Kimi K2.5 (Reasoning)

Not sourced

Reasoning profile

Grok 4.3

Reasoning

Kimi K2.5 (Reasoning)

Reasoning

Weight access

Grok 4.3

Proprietary

Kimi K2.5 (Reasoning)

Proprietary

License

Grok 4.3

Proprietary

Kimi K2.5 (Reasoning)

Proprietary

Release date

Grok 4.3

2026-04-30

Kimi K2.5 (Reasoning)

2026-02-01

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 4.3 has the higher public score estimate, 64.2 versus 58.53, but the 90% score intervals overlap.
Workload cost
Repository review: $0.07 vs $0.039. Cache-heavy agent loop: $0.09 vs $0.162.
Context tradeoff
Grok 4.3 has the larger documented window (1M).

Run the same representative tasks against both endpoints before changing production traffic.

Benchmark evidence

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

Browse raw public benchmark evidence10 rows

Agentic

  • Gert Labs

    Shared source
    Grok 4.343.86%
    Kimi K2.5 (Reasoning)32.58%

    Grok 4.3 leads this result

  • ResearchClawBench

    Grok 4.312.4%
    Source
    Kimi K2.5 (Reasoning)—

    Not directly comparable

  • Terminal-Bench 2.0

    Grok 4.3—
    Kimi K2.5 (Reasoning)50.8%
    Source

    Not directly comparable

  • BrowseComp

    Grok 4.3—
    Kimi K2.5 (Reasoning)60.6%
    Source

    Not directly comparable

Coding

  • SWE-bench Verified

    Grok 4.3—
    Kimi K2.5 (Reasoning)76.8%
    Source

    Not directly comparable

  • Vibe Code Bench

    Grok 4.3—
    Kimi K2.5 (Reasoning)17.54%
    Source

    Not directly comparable

Knowledge

  • GPQA

    Grok 4.3—
    Kimi K2.5 (Reasoning)87.6%
    Source

    Not directly comparable

  • MMLU-Pro

    Grok 4.3—
    Kimi K2.5 (Reasoning)87.1%
    Source

    Not directly comparable

Math

  • AIME 2025

    Grok 4.3—
    Kimi K2.5 (Reasoning)96.1%
    Source

    Not directly comparable

Multimodal

  • MMMU-Pro

    Grok 4.3—
    Kimi K2.5 (Reasoning)78.5%
    Source

    Not directly comparable

Frequently asked questions

Which is better, Grok 4.3 or Kimi K2.5 (Reasoning)?

Grok 4.3 has the higher public score estimate, 64.2 versus 58.53, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.

Which is better for coding, Grok 4.3 or Kimi K2.5 (Reasoning)?

The published evidence does not provide a shared weighted coding basis for both models, so BenchLM does not name a coding winner.

Which is better for agentic tasks, Grok 4.3 or Kimi K2.5 (Reasoning)?

The published evidence does not provide a shared weighted agentic tasks basis for both models, so BenchLM does not name a agentic tasks winner.

Which costs less, Grok 4.3 or Kimi K2.5 (Reasoning)?

For the stated presets, chat costs $0.0025 on Grok 4.3 and $0.0021 on Kimi K2.5 (Reasoning); repository review costs $0.07 and $0.039; the cache-heavy agent loop costs $0.09 and $0.162. Kimi K2.5 (Reasoning) has no published cached-input rate, so cached tokens use its listed input rate.

Which has the larger context window, Grok 4.3 or Kimi K2.5 (Reasoning)?

Grok 4.3 has the larger documented context window: 1M, compared with 256K.

Related comparisons

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Last updated July 30, 2026

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