LLM Comparison

GPT-6 Luna vs Reka Flash 3

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

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2/6 models

Same tier:

	GPT-6 Luna	Reka Flash 3
Organization	OpenAI	Reka
OpenTools Score		16 106
Family	GPT-6	Reka
Status	Current	Current
Release Date	Sep 2026	Mar 2025
Context Window	1.1M tokens	66K tokens
Input Price	$0.10/M tokens	$0.10/M tokens
Output Price	$0.50/M tokens	$0.20/M tokens
Pricing Notes	OpenAI standard API, USD per million tokens for prompts up to 272K input tokens: $0.10 input, $0.01 cached input, $0.125 cache writes, $0.50 output. Above 272K input tokens, the full request costs 2x input/cache and 1.5x output. Batch/Flex cost 50% of Standard; Fast costs 2x; regional processing adds 10% where available. Reasoning output tokens are charged at output rates.	—
Capabilities	textvisionreasoningcodingtool-uselong-contextcontext-caching	textcode
Training Cutoff	2026-05-18	—
Max Output	128K tokens	66K tokens
API Identifier	`gpt-6-luna`	`rekaai/reka-flash-3`
Benchmarks
Artificial Analysis Intelligence Index v4.3.2	37.2559686869738artificial-analysis	—
GPQA Diamond	—	52.9293artificial-analysis
AIME 2025	—	33.6667artificial-analysis
	View GPT-6 Luna	View Reka Flash 3

Cost Calculator

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Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Reka Flash 3Cheapest	$0.10	$0.10	$0.20	—
GPT-6 Luna	$0.10	$0.25	$0.35	+75%

OpenAI

GPT-6 Luna

GPT-6 Luna is OpenAI's efficient reasoning model for focused, high-volume tasks. It accepts text and images, produces text, supports a 1,050,000-token context window and 128,000 output tokens, and is available through the Responses and Chat Completions APIs under the exact gpt-6-luna identifier.

Reka

Reka Flash 3

Reka Flash 3 is a large language model from Reka. Supports up to 65,536 token context window. Available from $0.10/M input tokens.