Grok Code Fast 1 vs Kimi K2 Thinking Turbo

Name: Grok Code Fast 1
Author: xAI

Grok Code Fast 1 (2025) and Kimi K2 Thinking Turbo (2025) compare a coding-specialized model against a standalone API model. Grok Code Fast 1 ships a 262k-token context window, while Kimi K2 Thinking Turbo ships a 262k-token context window. On pricing, Grok Code Fast 1 costs $0.20/1M input tokens versus $1.15/1M for the alternative. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: Grok Code Fast 1 is coding-specialized model, while Kimi K2 Thinking Turbo is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first

Signal	Grok Code Fast 1	Kimi K2 Thinking Turbo	How to read it
Product type	Coding-specialized model	Standalone API model	Read downstream rows through the product-type lens before comparing benchmarks, prices, or provider availability.
Best for	custom coding agents, code generation, and tool loops	general production evaluation	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Long context	Primary workload tags from local decision data.
Context window	262k	262k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$1.50/1M tokens	$8/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	3 tracked	1 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	0 rows	0 rows	No shared benchmark rows are sourced for this pair yet.

Decision tradeoffs

Choose Grok Code Fast 1 when...

Grok Code Fast 1 has the lower cheapest tracked output price at $1.50/1M tokens.
Grok Code Fast 1 has broader tracked provider coverage for fallback and procurement flexibility.
Grok Code Fast 1 uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
Local decision data tags Grok Code Fast 1 for Coding, RAG, and Agents.

Choose Kimi K2 Thinking Turbo when...

Local decision data tags Kimi K2 Thinking Turbo for Long context.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Grok Code Fast 1

Requests / monthInput tokens / requestOutput tokens / request

Grok Code Fast 1

$535

Cheapest tracked route/tier: OpenRouter

Kimi K2 Thinking Turbo

$2,920

Cheapest tracked route/tier: Vercel AI Gateway

Estimated monthly gap: $2,385. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Grok Code Fast 1 -> Kimi K2 Thinking Turbo

No overlapping tracked provider route is sourced for Grok Code Fast 1 and Kimi K2 Thinking Turbo; plan for SDK, billing, or endpoint changes.
Kimi K2 Thinking Turbo is $6.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Check replacement coverage for Function calling, Tool use, and Structured outputs before moving production traffic.

Kimi K2 Thinking Turbo -> Grok Code Fast 1

No overlapping tracked provider route is sourced for Kimi K2 Thinking Turbo and Grok Code Fast 1; plan for SDK, billing, or endpoint changes.
Grok Code Fast 1 is $6.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Grok Code Fast 1 adds Function calling, Tool use, and Structured outputs in local capability data.

Specs

Specification	Grok Code Fast 1 xAI	Kimi K2 Thinking Turbo Moonshot AI
Released	2025-08-27	2025-11-06
Context window	262k	262k
Parameters	314B	1T (32B active)
Architecture	mixture of experts	-
License	Proprietary	MIT(OSI)
Openness	Proprietary	Open source
Commercial use	Commercial use with conditions	Commercial use allowed
Knowledge cutoff	-	-

Pricing and availability

Pricing attribute	Grok Code Fast 1	Kimi K2 Thinking Turbo
Input price	$0.20/1M tokens	$1.15/1M tokens
Output price	$1.50/1M tokens	$8/1M tokens
Providers	OpenRouter Microsoft Foundry xAI Console	Vercel AI Gateway

Capabilities

Capability	Grok Code Fast 1	Kimi K2 Thinking Turbo
Vision	No	No
Multimodal	No	No
Reasoning	No	No
Function calling	Yes	No
Tool use	Yes	No
Structured outputs	Yes	No
Code execution	No	No
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

No shared benchmark rows are currently sourced for this pair.

Deep dive

The capability footprint differs most on function calling: Grok Code Fast 1, tool use: Grok Code Fast 1, and structured outputs: Grok Code Fast 1. Both models share the core language-model surface, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.

For cost, Grok Code Fast 1 lists $0.20/1M input and $1.50/1M output tokens on the cheapest tracked provider, while Kimi K2 Thinking Turbo lists $1.15/1M input and $8/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Grok Code Fast 1 lower by about $2.62 per million blended tokens. Availability is 3 providers versus 1, so concentration risk also matters.

Choose Grok Code Fast 1 when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose Kimi K2 Thinking Turbo when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.

FAQ

Which has a larger context window, Grok Code Fast 1 or Kimi K2 Thinking Turbo?

Grok Code Fast 1 supports 262k tokens, while Kimi K2 Thinking Turbo supports 262k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.

Which is cheaper, Grok Code Fast 1 or Kimi K2 Thinking Turbo?

Grok Code Fast 1 is cheaper on tracked token pricing. Grok Code Fast 1 costs $0.20/1M input and $1.50/1M output tokens. Kimi K2 Thinking Turbo costs $1.15/1M input and $8/1M output tokens. Provider discounts or batch pricing can still change the final bill.

Is Grok Code Fast 1 or Kimi K2 Thinking Turbo open source?

Grok Code Fast 1 is listed under Proprietary. Kimi K2 Thinking Turbo is listed under MIT. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.

Which is better for function calling, Grok Code Fast 1 or Kimi K2 Thinking Turbo?

Grok Code Fast 1 has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.

Which is better for tool use, Grok Code Fast 1 or Kimi K2 Thinking Turbo?

Grok Code Fast 1 has the clearer documented tool use signal in this comparison. If tool use is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.

Where can I run Grok Code Fast 1 and Kimi K2 Thinking Turbo?

Grok Code Fast 1 is available on OpenRouter, Microsoft Foundry, and xAI Console. Kimi K2 Thinking Turbo is available on Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.

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Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.

Both models

Grok Code Fast 1 Kimi K2 Thinking Turbo