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AI Choice Engine

Model comparison

Grok 4.7 vs Kimi K3

SpaceXAI against Moonshot AI, compared on context, price, and verified benchmark results.

Catalog record checked September 26, 2026Individual provider fields may changeEvidence confidence: High — see receipts below

SpaceXAI

Grok 4.7

Frontier

vs

Moonshot AI

Kimi K3

Frontier · Open weights

AI model capability comparison
SpecificationGrok 4.7Kimi K3
ProviderSpaceXAIMoonshot AI
TierFrontierFrontier
Context window500KWinner: 1.05M
Max outputNot verifiedUnverified1.05M
Input / 1M tokensWinner: $2$3
Output / 1M tokensWinner: $6$15
WeightsClosedOpen
Parametersnew, larger base model with longer RL on multi-hour tasks2.8T (open-weight MoE)
Reasoning levelslow, medium, high, xhighlow, high, max
Modalitiestext, imagetext, image, video
API model idgrok-4.7kimi-k3
ReleasedSeptember 21, 2026July 16, 2026
Artificial Analysis Intelligence Index [xhigh] (2026-09-26)46.4Not verifiedUnverified
Artificial Analysis Intelligence Index [max] (2026-09-26)Not verifiedUnverified43.6
DeepSWE 1.1 [high] (2026-09-21)71Not verifiedUnverified
Terminal-Bench 4.0 [xhigh] (2026-09-26)25.8Not verifiedUnverified
Terminal-Bench 2.1 (2026-07-27)Not verifiedUnverified88.3
GPQA Diamond (2026-07-27)Not verifiedUnverified93.5
Humanity's Last Exam (2026-07-27)Not verifiedUnverified56
SWE-bench Verified (2026-09-01)Not verifiedUnverified93.4

Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.

Benchmark receipts

Where each score comes from, and how far it can be compared across models.

Pricing tiers

Grok 4.7: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026.

Kimi K3: $3/$15 per MTok; cached input $0.30/MTok. max_completion_tokens can be set up to 1,048,576 (default 131,072). Open-weight under the custom Kimi K3 License (not a standard open-source licence). 2.8T MoE with native vision.

FrontierRecord checked September 26, 2026

Grok 4.7

Grok 4.7 is xAI's flagship since 2026-09-21 — a larger new base model with longer RL on multi-hour tasks, at Grok 4.6's $2/$6 price.

Best for

  • Coding agents
  • Cost-sensitive frontier work
  • Cursor and GitHub Copilot users

Watch out

Token rates double above a 200K-token prompt and there is no Batch API; the DeepSWE figure is vendor-reported.

FrontierOpen weightsRecord checked September 26, 2026

Kimi K3

Kimi K3 is Moonshot AI's open-weight frontier model — 2.8T MoE, 1M context, tied near the top of open-weight leaderboards.

Best for

  • Open-weight frontier work
  • Long-context
  • Multimodal

Watch out

Self-hosting needs large clusters; hosted rates vary.

When the cheaper one wins

Grok 4.7 is cheaper on output at $6 per million tokens against $15 for Kimi K3 — about 2.5×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.

Run the model picker

Evidence confidence: High

How strong and complete the evidence behind this comparison is — not a prediction of which model is better.

  • Pricing verified on both sides — Input and output rates are verified for both models.
  • 4/5 core specs verified on both sides — Not published for at least one side: max output.
  • 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
  • Verified within the last 90 days — Newest catalog check was 2 days ago.
  • Both models carry source citations — Each side has at least two catalog sources on record.

Source receipts

Each catalog figure was checked against the provider or an independent second source on the date shown.

Related comparisons

Diving deeper on one model? Grok 4.7 · Kimi K3

Common questions

Grok 4.7 vs Kimi K3

Answered from the verified figures on this page rather than general guidance.

Is Grok 4.7 or Kimi K3 cheaper for input?
Grok 4.7 is cheaper at $2 per million input tokens, against $3 for Kimi K3 — roughly 1.5× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Grok 4.7 has tiered pricing: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026. Kimi K3 has tiered pricing: $3/$15 per MTok; cached input $0.30/MTok. max_completion_tokens can be set up to 1,048,576 (default 131,072). Open-weight under the custom Kimi K3 License (not a standard open-source licence). 2.8T MoE with native vision.
Is Grok 4.7 or Kimi K3 cheaper for output?
Grok 4.7 is cheaper at $6 per million output tokens, against $15 for Kimi K3 — roughly 2.5× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Grok 4.7 has tiered pricing: $2/$6 per MTok (<200K prompt); $4/$12 for all tokens at ≥200K. Cached input $0.50/MTok ($1.00 at ≥200K). US regional endpoint 1.1x. No Batch API; the 2x-price 'Fast' variant is Cursor and Grok Build only. xAI lists no separate text-output cap. Knowledge cutoff May 2026. Kimi K3 has tiered pricing: $3/$15 per MTok; cached input $0.30/MTok. max_completion_tokens can be set up to 1,048,576 (default 131,072). Open-weight under the custom Kimi K3 License (not a standard open-source licence). 2.8T MoE with native vision.
Which has the larger context window, Grok 4.7 or Kimi K3?
Kimi K3 accepts 1.05M tokens against 500K for Grok 4.7. This only matters if you routinely send very long documents or large codebases.
Do Grok 4.7 and Kimi K3 support the same reasoning levels?
Grok 4.7 exposes low, medium, high, xhigh, while Kimi K3 exposes low, high, max.
Should I use Grok 4.7 or Kimi K3?
Both sit in the frontier tier, so the choice usually comes down to price and context rather than capability. Grok 4.7 suits coding agents; Kimi K3 suits open-weight frontier work.
Can I self-host Grok 4.7 or Kimi K3?
Kimi K3 publishes open weights, but self-hosting and third-party provider access depend on the licence, hardware, serving support, and availability. Grok 4.7 is a closed model whose supported access paths are controlled by its provider.

Next step

Choosing between them

The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.

  • Input price: Grok 4.7 costs $2 per 1M tokens versus $3 for Kimi K3 — a 1.5x difference at the headline tier.
  • Context: Kimi K3 takes 1.05M against 500K for Grok 4.7 — only decisive if your prompts approach the smaller window.
  • Measured capability: Grok 4.7 leads Artificial Analysis Intelligence Index 46.4 to 43.6 (measured 2026-09-26).
  • Deployment: Kimi K3 publishes weights you can self-host; the other is API-only.
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