Compare AI models: GPT-5.6 Luna vs Step 5 Preview

GPT-5.6 LunaOpenAI
Step 5 PreviewStepFunHollow points use fallbacks · hover for details

ReasoningCodingCost efficiencyContext windowMultimodalTool use

Normalized model capability scores
Model	Reasoning	Coding	Cost efficiency	Context window	Multimodal	Tool use
GPT-5.6 Luna	69/100	81/100	56/100	98/100	50/100	64/100
Step 5 Preview	50/100 — Reasoning supported; no comparable benchmark	50/100 — No data; neutral placeholder	37/100	82/100	50/100	50/100 — Tool calling supported; no comparable benchmark

Overview

Author

OpenAI

Stepfun

Context length

1.1M

Reasoning

True

Input modalities

Text, Image, Pdf

Text, Image, Video

Output modalities

Text

Providers

OpenAI

Stepfun

Pricing

Input

$0.20/ 1M

$1.00/ 1M

Output

$1.20/ 1M

$2.70/ 1M

Cached input

$0.02/ 1M

$0.05/ 1M

MomentumLast 2 mo

Unique users

344K

114K

Completed sessions

2,017,009

2,634,399

Token share

0.24%

0.63%

Tokens

2.7T-49%

7.2T+100%

AUG 30OCT 24

RetentionWeek 1

Returning users

56.8%32K user-weeks

77.1%933 user-weeks

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