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Home / Compare / AI models / Kimi K3.1 Pro vs GPT-6.1 Sol

Kimi K3.1 Pro vs GPT-6.1 Sol

Official Kimi and OpenAI API prices and LMArena scores, checked 2026-10-29. Add up to 2 more models to compare 4.

Verdict

Same bill; GPT-6.1 Sol wins more LMArena tasks.

Kimi K3.1 Pro and GPT-6.1 Sol have the same list price per token ($2 in, $10 out per 1M). GPT-6.1 Sol scores 21 points higher for coding. Across 1 shared LMArena task, GPT-6.1 Sol leads 1 to 0. A medium month (20M input + 5M output tokens) costs $90 on Kimi K3.1 Pro and $90 on GPT-6.1 Sol.

  • Pick Kimi K3.1 Pro if nothing here clearly favors it (no lower bill, bigger context, cheaper cache or LMArena lead of 3+ points over GPT-6.1 Sol).
  • Pick GPT-6.1 Sol if you care most about coding (+21) or you reuse long prompts (cached input $0.10 vs $0.20).
Sample month

Medium: 20M input + 5M output tokens a month at list price (short-context rate, no caching or batch discounts).

Kimi K3.1 ProvsGPT-6.1 Sol
Price per 1M tokens
Input$2$2
Cached input$0.20$0.10 (better)
Output$10$10
Sample month, medium$90$90
Context
Context window1.05M1.05M (better)
Quality (LMArena relative score, out of 100)
Coding5778 (better)
Chatn/a26
Creative writingn/a11
Roleplay and charactersn/a4
Reasoning and mathn/a59
Visionn/a85
Long documentsn/an/a
Cheap bulk and agentsn/a78

Marked side is better: lower for prices, higher for context and scores. Bars are scaled to the larger of the two.

Spec
Kimi K3.1 Pro
GPT-6.1 Sol
Price per 1M tokens
Input$2$2
Cached input$0.20$0.10
Output$10$10
Blend 3:1$4$4
Sample month, medium$90$90
Context
Context window1.04858M tokens1.05M tokens
Quality (LMArena, out of 100)
Coding57/100 #6 of 5078/100 #4 of 50
ChatNot ranked26/100 #13 of 51
Creative writingNot ranked11/100 #14 of 51
Roleplay and charactersNot ranked4/100 #14 of 51
Reasoning and mathNot ranked59/100 #6 of 51
VisionNot ranked85/100 #2 of 33
Long documentsNot rankedNot ranked
Cheap bulk and agentsNot ranked78/100 #5 of 34
Details
ProviderKimiOpenAI
API model idkimi-k3.1-progpt-6.1-sol
NotesFlat price across the 1M window. Cache writes cost $2 (5-minute) or $4 (1-hour).Prompts up to 272K. Longer prompts cost $4 in, $15 out.
Sources
Last checked2026-10-292026-10-29
Official pricingKimi pricingOpenAI pricing

API prices in USD per 1M tokens from each provider's official pricing page. Blend 3:1 = (3 x input + output) / 4. Sample month = stated input and output tokens at the list price, no caching. Quality: relative score out of 100 on each LMArena leaderboard (100 = top model we price on that board, n/a = not ranked there), data licensed CC BY 4.0. See how we pick.

Where each one ranks on LMArena

Relative score out of 100 on each leaderboard (100 = the top model we price there), with the rank among the models from our API price table that appear on that board.

  • Coding (Code Arena): Kimi K3.1 Pro #6 of 50 (57/100), GPT-6.1 Sol #4 of 50 (78/100)
  • Chat (Text Arena): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #13 of 51 (26/100)
  • Creative writing (Text Arena creative writing): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #14 of 51 (11/100)
  • Roleplay and characters (Text Arena multi-turn): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #14 of 51 (4/100)
  • Reasoning and math (Text Arena math): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #6 of 51 (59/100)
  • Vision (Vision Arena): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #2 of 33 (85/100)
  • Long documents (Document Arena): Kimi K3.1 Pro not ranked, GPT-6.1 Sol not ranked
  • Cheap bulk and agents (Agent Arena): Kimi K3.1 Pro not ranked, GPT-6.1 Sol #5 of 34 (78/100)

Pricing details from the official pages

Kimi K3.1 Pro lists $2 input, $10 output, $0.20 cached input per 1M tokens on Kimi pricing. GPT-6.1 Sol lists $2 input, $10 output, $0.10 cached input per 1M tokens on OpenAI pricing. Prices checked 2026-10-29.

  • Kimi K3.1 Pro: Flat price across the 1M window. Cache writes cost $2 (5-minute) or $4 (1-hour).
  • GPT-6.1 Sol: Prompts up to 272K. Longer prompts cost $4 in, $15 out.

Sample monthly bill at list price, no caching: Light (2M input + 0.5M output tokens): $9 vs $9. Medium (20M input + 5M output tokens): $90 vs $90. Heavy (200M input + 50M output tokens): $900 vs $900.

FAQ

Is Kimi K3.1 Pro cheaper than GPT-6.1 Sol?

They have the same list price: $2 input and $10 output per 1M tokens.

Which is better for coding, Kimi K3.1 Pro or GPT-6.1 Sol?

On LMArena's Code Arena Kimi K3.1 Pro scores 57/100 (#6 of 50) and GPT-6.1 Sol 78/100 (#4 of 50), so GPT-6.1 Sol is ahead by 21 points.

Which has the bigger context window?

Kimi K3.1 Pro: 1.04858M tokens. GPT-6.1 Sol: 1.05M tokens. Long prompts can cost more; see the pricing notes above.

How much do Kimi K3.1 Pro and GPT-6.1 Sol cost per month?

Light (2M input + 0.5M output tokens): $9 vs $9. Medium (20M input + 5M output tokens): $90 vs $90. Heavy (200M input + 50M output tokens): $900 vs $900. Pick your own token counts in the plan vs API calculator.

Where do these numbers come from?

Prices come from each provider's official pricing page, checked daily. Quality is the relative score on the LMArena leaderboard dataset, licensed CC BY 4.0. Where a model is not ranked we show n/a.

Sources

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