AI Index

GPT-6 AstravsKimi K3

Both language models, compared at each maker’s own API list prices. Every figure links to its source.

Compare at your usage

Every model priced for the same request
Prompt per request
Cache hits
Batch
Service tier

8,000 tokens in, 2,000 out

GPT-6 Astra on OpenAI APIKimi K3 on Moonshot AI Platform
Rate appliedBase rateBase rate
Inputper 1M tokens$10.00 $3.00
Cache readper 1M tokens$1.00 $0.30
Outputper 1M tokens$50.00 $15.00
Cost per request$0.18$0.054
Per 1,000 requests$180.00$54.00

Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.

Cost per request as prompts grow

2K tokens out, list price on each maker’s API. GPT-6 Astra charges $20.00 / $75.00 above 272K tokens.

0$2.00$4.00$6.000250K500K750K1Mprompt tokens per request272K8KGPT-6 Astra$0.18 at 8KKimi K3$0.054 at 8K
  • GPT-6 Astra · OpenAI API
  • Kimi K3 · Moonshot AI Platform

Where each stands among all scored models

Each line runs from the lowest to the highest score on the board; the tick is the median.

Epoch Capabilities Index#1 vs #21 of 118Kimi K3: 158.5GPT-6 Astra: 169.1LMArena Text#29 vs #15 of 163Kimi K3: 1,488GPT-6 Astra: 1,476LMArena Text · Coding#9 vs #11 of 163Kimi K3: 1,540GPT-6 Astra: 1,542LMArena Text · Chinese#32 vs #10 of 161Kimi K3: 1,543GPT-6 Astra: 1,515
  • GPT-6 Astra
  • Kimi K3

Key differences

GPT-6 AstraKimi K3
InputMaker’s official API · global · USD
$10.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$3.00 / 1M tokens Moonshot AI platform pricing · as of Nov 1, 2026
OutputMaker’s official API · global · USD
$50.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$15.00 / 1M tokens Moonshot AI platform pricing · as of Nov 1, 2026
Context
1,050,000 GPT-6 Astra model · as of Nov 5, 2026
1,048,576 Moonshot AI platform pricing · as of Nov 1, 2026
Max output
128,000 GPT-6 Astra model · as of Nov 5, 2026
1,048,576 Kimi API chat completions reference · as of Nov 1, 2026
Input modalities
Text, Image GPT-6 Astra model · as of Nov 5, 2026
Text, Image, Video moonshotai/Kimi-K3 model card · as of Oct 30, 2026
Cache readMaker’s official API · global · USD
$1.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.30 / 1M tokens Moonshot AI platform pricing · as of Nov 1, 2026

These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.

Full comparison

GPT-6 Astra OpenAI Kimi K3 Moonshot AI
Overview
ReleasedSep 3, 2026 Jul 2026
Open weights— Yes
Knowledge cutoffApr 2026 Not stated
Specs
Context1.05M 1.05M
Max input922K Not stated
Max output128K 1.05M
Input modalitiesText, Image Text, Image, Video
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortslow, medium, high, xhigh, max low, high, max
Reasoning can be off— Yes
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$10.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier $3.00
Output price$50.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier $15.00
Cache read price$1.00Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens, Ultrafast tier $0.30
Cache write price$12.50Also priced under other conditions: 30-minute cache, 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier, Ultrafast tier $3.00Also priced under other conditions: 1-hour cache5-minute cache
Cache write price (1-hour cache)Not offered $6.001-hour cache
Blended price (3 input : 1 output)$20.00 $6.00
Pricing under conditions · per 1M tokens
Input price, long prompts$20.00Prompts over 272K tokens Not offered
Output price, long prompts$75.00Prompts over 272K tokens Not offered
Batch input price$5.00Batch Not offered
Batch output price$25.00Batch Not offered
Flex tier input price$5.00Flex tier Not offered
Flex tier output price$25.00Flex tier Not offered
Cited scores
Epoch Capabilities Index169.1 158.5
LMArena Text1,476 max effort1,488 max effort
LMArena Text · Coding1,542 max effort1,540 max effort
LMArena Vision1,280 max effort—
LMArena Text · Chinese1,515 max effort1,543 max effort
Epoch AI · GPQA Diamond95.8% max effort93.1% max effort
Epoch AI · FrontierMath Tiers 1–393.7% max effort72.2% max effort

Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.

Model details and sources

Cited scores