AI Index

GPT-6 LunavsMistral Small 4

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 Luna on OpenAI APIMistral Small 4 on Mistral AI API
Rate appliedBase rateBase rate
Inputper 1M tokens$0.10 $0.15
Cache readper 1M tokens$0.010 $0.015
Outputper 1M tokens$0.50 $0.60
Cost per request$0.0018$0.0024
Per 1,000 requests$1.80$2.40

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 Luna charges $0.20 / $0.75 above 272K tokens. A line ends at the model’s context window.

0$0.020$0.040$0.0600250K500K750K1Mprompt tokens per request272K8KGPT-6 Luna$0.0018 at 8KMistral Small 4$0.0024 at 8K
  • GPT-6 Luna · OpenAI API
  • Mistral Small 4 · Mistral AI API

Key differences

GPT-6 LunaMistral Small 4
InputMaker’s official API · global · USD
$0.10 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.15 / 1M tokens Mistral pricing · as of Nov 4, 2026
OutputMaker’s official API · global · USD
$0.50 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.60 / 1M tokens Mistral pricing · as of Nov 4, 2026
Context
1,050,000 GPT-6 Luna · as of Nov 2, 2026
256,000 Mistral docs: mistral-small-4-0-26-03 · as of Nov 3, 2026
Cache readMaker’s official API · global · USD
$0.010 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.015 / 1M tokens Mistral pricing · as of Nov 4, 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 Luna OpenAI Mistral Small 4 Mistral AI
Overview
ReleasedSep 22, 2026 Mar 16, 2026
Open weights— Yes
Knowledge cutoffMay 2026 Jun 2025
Specs
Context1.05M 256K
Max input922K Not stated
Max output128K 256K
Input modalitiesText, Image Text, Image
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsnone, low, medium, high, xhigh, max none, high
Reasoning can be offYes Yes
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$0.10Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $0.15
Output price$0.50Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $0.60
Cache read price$0.010Also priced under other conditions: Batch, Flex tier, Fast tier, Prompts over 272K tokens $0.015
Cache write price$0.125Also priced under other conditions: 30-minute cache, 12-hour cache, Prompts over 272K tokens, Batch, Flex tier, Fast tier —
Blended price (3 input : 1 output)$0.20 $0.2625
Pricing under conditions · per 1M tokens
Input price, long prompts$0.20Prompts over 272K tokens Not offered
Output price, long prompts$0.75Prompts over 272K tokens Not offered
Batch input price$0.050Batch Not offered
Batch output price$0.25Batch Not offered
Flex tier input price$0.050Flex tier Not offered
Flex tier output price$0.25Flex tier Not offered
Cited scores
Epoch Capabilities Index156.7 —
LMArena Text1,441 max effort—
LMArena Text · Coding1,506 max effort—
LMArena Vision1,216 max effort—
LMArena Text · Chinese1,483 max effort—
Epoch AI · GPQA Diamond90.5% max effort—
Epoch AI · FrontierMath Tiers 1–378.9% 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