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Model comparison - Similar price, same tier

GPT-6.1 Sol vs Kimi K3

GPT-6.1 Sol is from OpenAI and Kimi K3 is from Moonshot AI. On list price, Kimi K3 charges 1.5x GPT-6.1 Sol's input price ($3 vs $2 per 1M tokens), and Kimi K3 charges 1.5x GPT-6.1 Sol's output price ($15 vs $10 per 1M tokens). GPT-6.1 Sol has a 1,050,000-token context window and Kimi K3 1,048,576 tokens; max output is 128,000 and 1,048,576 tokens per response. GPT-6.1 Sol was released on September 29, 2026; no primary source states a release date for Kimi K3. Kimi K3 publishes open weights (Kimi K3 License (Hugging Face license tag: other)); GPT-6.1 Sol is closed-weights.

Last verified from each provider's pricing page. All sources

OpenAI - Closed

GPT-6.1 Sol
Input / 1M
$2
Output / 1M
$10
Context
1.05M

Moonshot AI - Open

Kimi K3
Input / 1M
$3
Output / 1M
$15
Context
1.05M

Side-by-side specs

SpecGPT-6.1 SolKimi K3
ProviderOpenAIMoonshot AI
Input / 1M tokens$2$3
Output / 1M tokens$10$15
Cache read / 1M$0.10$0.30
Cache write / 1M$2.50$3
Batch input / 1M$1-
Batch output / 1M$5-
Long-context rates above272,000 tokens-
Context window1,050,0001,048,576
Max output128,0001,048,576
Release date-
WeightsClosedOpen
License-Kimi K3 License (Hugging Face license tag: other)
API model idgpt-6.1-solkimi-k3
AI Gateway idopenai/gpt-6.1-solmoonshotai/kimi-k3
Last verified

Prices in USD per 1M tokens at each provider's standard first-party rate. A dash means the provider does not bill that item separately or no primary page states it.

What each costs in practice

The same three workloads every model page uses, worked from each model's standard list rates. Swap in your own token counts with the math on each model's page.

WorkloadGPT-6.1 SolKimi K3
One agent session1M input tokens and 100K output tokens, no caching.$3.00$4.50
A chat app10,000 requests a day at 2K input and 500 output tokens each.$90.00$2,700.00 per 30-day month$135.00$4,050.00 per 30-day month
The same session at a 90% cache hit90% of the input is read from the prompt cache. The one-time cache write premium is not included.$1.29$2.07
Show the math

GPT-6.1 Sol

  • One agent sessionInput: 1M x $2 = $2.00Output: 0.1M x $10 = $1.00
  • A chat appInput: 20M x $2 = $40.00Output: 5M x $10 = $50.00
  • The same session at a 90% cache hitCached input: 0.9M x $0.10 = $0.09Uncached input: 0.1M x $2 = $0.20Output: 0.1M x $10 = $1.00

Kimi K3

  • One agent sessionInput: 1M x $3 = $3.00Output: 0.1M x $15 = $1.50
  • A chat appInput: 20M x $3 = $60.00Output: 5M x $15 = $75.00
  • The same session at a 90% cache hitCached input: 0.9M x $0.30 = $0.27Uncached input: 0.1M x $3 = $0.30Output: 0.1M x $15 = $1.50

Benchmarks under the same setting

Only boards that list both models under the same run setting appear here, one row per board and setting, with each score exactly as the board shows it. Scores on different boards use different scales and are never combined.

Board and settingGPT-6.1 SolKimi K3
LMArena Text (Text Arena Overall)Text Arena Overall, default leaderboard view (8,834,211 votes, 416 models)Official leaderboard - arena.ai1484±81487±5
LMArena WebDev (Code Arena WebDev Overall)Code Arena WebDev Overall, default leaderboard view (891,922 votes, 145 models)Official leaderboard - arena.ai1755+13/-131655+6/-6

Set them up in your tools

Step-by-step guides whose official docs list GPT-6.1 Sol or Kimi K3 by model id.

Model pages

OpenAIGPT-6.1 Sol pricing and specsFull rate card, worked cost examples and sources. Closed weights.Moonshot AIKimi K3 pricing and specsFull rate card, worked cost examples and sources. Open weights.

FAQ

How do GPT-6.1 Sol and Kimi K3 compare on price?

On list price, Kimi K3 charges 1.5x GPT-6.1 Sol's input price ($3 vs $2 per 1M tokens), and Kimi K3 charges 1.5x GPT-6.1 Sol's output price ($15 vs $10 per 1M tokens). For one agent session of 1M input and 100K output tokens with no caching, that is $3.00 on GPT-6.1 Sol and $4.50 on Kimi K3. Prices are each provider's first-party list rates, verified October 17, 2026 and October 17, 2026.

What are the context windows of GPT-6.1 Sol and Kimi K3?

GPT-6.1 Sol has a 1,050,000-token context window and Kimi K3 1,048,576 tokens; max output is 128,000 and 1,048,576 tokens per response.

Are GPT-6.1 Sol and Kimi K3 open weights?

GPT-6.1 Sol is closed-weights and is called through OpenAI's API as gpt-6.1-sol. Kimi K3's weights are published at huggingface.co under the Kimi K3 License (Hugging Face license tag: other).

More comparisons

Sources

GPT-6.1 Sol verified from developers.openai.com; Kimi K3 verified from platform.kimi.ai. This page is as current as the older of the two: .

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