| Signal | Grok Code Fast 1 | Delta | Kimi K2 0905 |
|---|---|---|---|
Capabilities | 83 | +33 | |
Pricing | 2 | 0 | |
Context window size | 86 | +5 | |
Recency | 93 | -2 | |
Output Capacity | 67 | +47 | |
| Overall Result | 3 wins | of 5 | 2 wins |
7
days higher
8
days
15
days higher
xAI
Moonshot AI
Grok Code Fast 1 saves you $45.00/month
That's $540.00/year compared to Kimi K2 0905 at your current usage level of 100K calls/month.
| Metric | Grok Code Fast 1 | Kimi K2 0905 | Winner |
|---|---|---|---|
| Overall Score | 40 | 40 | -- |
| Rank | #205 | #203 | Kimi K2 0905 |
| Quality Rank | #205 | #203 | Kimi K2 0905 |
| Adoption Rank | #205 | #203 | Kimi K2 0905 |
| Parameters | -- | -- | -- |
| Context Window | 256K | 131K | Grok Code Fast 1 |
| Pricing | $0.20/$1.50/M | $0.40/$2.00/M | -- |
| Signal Scores | |||
| Capabilities | 83 | 50 | Grok Code Fast 1 |
| Pricing | 2 | 2 | Kimi K2 0905 |
| Context window size | 86 | 81 | Grok Code Fast 1 |
| Recency | 93 | 95 | Kimi K2 0905 |
| Output Capacity | 67 | 20 | Grok Code Fast 1 |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Here's what the scores mean for these two models:
Scores 40/100 (rank #205), placing it in the top 30% of all 290 models tracked.
Scores 40/100 (rank #203), placing it in the top 30% of all 290 models tracked.
With only a 0-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
Grok Code Fast 1 offers 29% better value per quality point. At 1M tokens/day, you'd spend $25.50/month with Grok Code Fast 1 vs $36.00/month with Kimi K2 0905 - a $10.50 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Higher benchmark score (0/100) indicates stronger performance on coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Faster response time (speed score 0/100) is critical for user-facing chat. Grok Code Fast 1 also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (256K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($1.50/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (40/100) correlates with better nuance, coherence, and style in long-form content
Grok Code Fast 1 and Kimi K2 0905 are extremely close in overall performance (only 0 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
Best for Quality
Grok Code Fast 1
Marginally better benchmark scores; both are excellent
Best for Cost
Grok Code Fast 1
29% lower pricing; better value at scale
Best for Reliability
Grok Code Fast 1
Higher uptime and faster response speeds
Best for Prototyping
Grok Code Fast 1
Stronger community support and better developer experience
Best for Production
Grok Code Fast 1
Wider enterprise adoption and proven at scale
by xAI
| Capability | Grok Code Fast 1 | Kimi K2 0905 |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoningdiffers | ||
| Web Searchdiffers | ||
| Image Output |
xAI
Moonshot AI
Grok Code Fast 1 saves you $0.9600/month
That's 31% cheaper than Kimi K2 0905 at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Grok Code Fast 1 | Kimi K2 0905 |
|---|---|---|
| Context Window | 256K | 131K |
| Max Output Tokens | 10,000 | -- |
| Open Source | No | Yes |
| Created | Aug 26, 2025 | Sep 4, 2025 |
Both Grok Code Fast 1 and Kimi K2 0905 score 40/100, making them extremely close competitors. Choose based on pricing, provider ecosystem, or specific capability requirements.
Grok Code Fast 1 is ranked #205 and Kimi K2 0905 is ranked #203 out of 290+ AI models. Rankings use a composite score combining benchmark performance (90%) from MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations, with capabilities and context window as tiebreakers (10%). Scores update hourly.
Grok Code Fast 1 is cheaper at $1.50/M output tokens vs Kimi K2 0905's $2.00/M output tokens - 1.3x more expensive. Input token pricing: Grok Code Fast 1 at $0.20/M vs Kimi K2 0905 at $0.40/M.
Grok Code Fast 1 has a larger context window of 256,000 tokens compared to Kimi K2 0905's 131,072 tokens. A larger context window means the model can process longer documents and conversations.