LLM Comparison

GPT-5.6 Luna vs Kimi K2 0905

Side-by-side specs, pricing & capabilities · Updated September 2026

Price vs Intelligence

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2/6 models

Same tier:

	GPT-5.6 Luna	Kimi K2 0905
Organization	OpenAI	Moonshot AI
OpenTools Score	52 74.7	48 40.3
Family	GPT-5.6	Kimi
Status	Current	Current
Release Date	Jul 2026	Sep 2025
Context Window	1.1M tokens	262K tokens
Input Price	$0.20/M tokens	$0.40/M tokens
Output Price	$1.20/M tokens	$2.00/M tokens
Pricing Notes	OpenAI pricing page lists $1 input and $6 output per 1M tokens, plus GPT-5.6 cache-write and cache-read pricing.	—
Capabilities	textvisionreasoningcodingtool-useweb-searchfile-searchcomputer-useagents	textcode
Training Cutoff	Feb 16, 2026	—
Max Output	128K tokens	262K tokens
API Identifier	`gpt-5.6-luna`	`moonshotai/kimi-k2-0905`
Benchmarks
Artificial Analysis Intelligence Index	51artificial-analysis	—
Artificial Analysis Coding Agent Index	74.6artificial-analysis	—
Artificial Analysis Intelligence Index v4.3	37.5048artificial-analysis	—
GPQA Diamond	91.1111artificial-analysis	76.6667artificial-analysis
SciCode	53.588artificial-analysis	—
Terminal-Bench 2.1	80.8989artificial-analysis	—
AIME 2025	—	57.3333artificial-analysis
	View GPT-5.6 Luna	View Kimi K2 0905

Cost Calculator

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Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
GPT-5.6 LunaCheapest	$0.20	$0.60	$0.80	—
Kimi K2 0905	$0.40	$1.00	$1.40	+75%

OpenAI

GPT-5.6 Luna

GPT-5.6 Luna is OpenAI lower-cost GPT-5.6 model for high-volume reasoning, coding, and agentic workloads. OpenAI model docs list the same 1.05M token context window, 128K max output, and major tool support as the larger GPT-5.6 variants.

Moonshot AI

Kimi K2 0905

Kimi K2 0905 is a large language model from Moonshot AI. Supports up to 262,144 token context window. Available from $0.40/M input tokens.