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Gemini 2.5 Flash vs Kimi K2.5

Complete pricing and performance comparison between Google's Gemini 2.5 Flash and Moonshot's Kimi K2.5.

Quick Verdict

Cheaper
Gemini 2.5 Flash
2.0x cheaper input, 1.2x cheaper output
Larger Context
Gemini 2.5 Flash
1.0M vs 262K
Higher Quality
Kimi K2.5
Score: 47 vs 21
Faster
Gemini 2.5 Flash
231 vs 37 tok/s

Pricing Comparison

SpecGemini 2.5 FlashKimi K2.5Difference
ProviderGoogleMoonshot
Input / 1M tokens$0.3$0.6Gemini 2.5 Flash is 50% more expensive
Output / 1M tokens$2.5$3Gemini 2.5 Flash is 17% more expensive
Context Window1.0M262K4x difference
Max Output66K33K

Performance Benchmarks

MetricGemini 2.5 FlashKimi K2.5Winner
Quality Index2147Kimi K2.5
Output Speed231 tok/s37 tok/sGemini 2.5 Flash
Time to First Token0.42s1.45sGemini 2.5 Flash
Value (Quality/$)68.778.0Higher = better value

Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.

Cost at Scale

Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).

UsageGemini 2.5 FlashKimi K2.5Savings
Single request
1K in / 300 out
$0.0010$0.0015Same
10 requests
10K in / 3K out
$0.010$0.015Gemini 2.5 Flash saves $0.0045
100 requests
100K in / 30K out
$0.105$0.150Gemini 2.5 Flash saves $0.045
1,000 requests
1M in / 300K out
$1.05$1.50Gemini 2.5 Flash saves $0.450
10,000 requests
10M in / 3M out
$10.50$15.00Gemini 2.5 Flash saves $4.50
1M requests/mo
1B in / 300M out
$1050.00$1500.00Gemini 2.5 Flash saves $450.00

Pros & Cons

Gemini 2.5 Flash Strengths

  • +Cheaper input tokens
  • +Cheaper output tokens
  • +Larger context window (1.0M vs 262K)
  • +Higher max output tokens
  • +Faster output (231 vs 37 tok/s)
  • +Lower latency (faster first token)

Kimi K2.5 Strengths

  • +Higher quality score (47 vs 21)

When to Use Each Model

Choose Gemini 2.5 Flash for

  • →Budget-conscious projects where cost is the primary factor
  • →Long documents, large codebases, or multi-turn conversations
  • →Generating long-form content or detailed code
  • →Real-time applications, chat, or autocomplete

Choose Kimi K2.5 for

  • →Tasks requiring maximum accuracy and reasoning

Frequently Asked Questions

Which is cheaper, Gemini 2.5 Flash or Kimi K2.5?
For input tokens, Gemini 2.5 Flash is 2.0x cheaper at $0.3/1M tokens. For output tokens, Gemini 2.5 Flash is 1.2x cheaper at $2.5/1M tokens. At typical usage (1M input + 300K output), Gemini 2.5 Flash costs $1.05 vs Kimi K2.5 at $1.50.
What's the context window difference?
Gemini 2.5 Flash supports 1.0M context (1,048,576 tokens), while Kimi K2.5 supports 262K (262,144 tokens). Gemini 2.5 Flash can handle 4x more context in a single request.
Which model has better benchmarks?
Quality Index: Gemini 2.5 Flash scores 21 vs Kimi K2.5 at 47. Speed: Gemini 2.5 Flash generates 231 tok/s vs Kimi K2.5 at 37 tok/s. Time to first token: Gemini 2.5 Flash at 0.42s vs Kimi K2.5 at 1.45s.
When should I choose Gemini 2.5 Flash over Kimi K2.5?
Choose Gemini 2.5 Flash when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (1.0M vs 262K), Higher max output tokens, Faster output (231 vs 37 tok/s), Lower latency (faster first token). Choose Kimi K2.5 when you need: Higher quality score (47 vs 21).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 2.5 Flash = $10.50, Kimi K2.5 = $15.00. At 10K input + 1K output per request (longer conversations): Gemini 2.5 Flash = $55.00, Kimi K2.5 = $90.00.

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Gemini 2.5 Flash DetailsKimi K2.5 DetailsFull Pricing TableCost Calculator