LlamaIndex vs Mastra

as AI assistants see them, week of 2026-09-14

brag about it: X · LinkedIn

LlamaIndex and Mastra both sit near the bottom of the pack, with overall scores of 7 and 8 out of 100. LlamaIndex is named in 10 of 71 answers, Mastra in 12 of 71. Their strengths differ by assistant: LlamaIndex scores highest with Gemini (18) and lowest with Claude (2), while Mastra scores highest with Claude (18) and gets 0 from Gemini. Both tie for "Which AI agent framework should a developer choose?" and "What are the best platforms for building AI agents?", each named in 2 of 3 and 2 of 4 answers respectively. Head-to-head, they're tied on 13 questions, with Mastra edging ahead on 4 and LlamaIndex on 3.

Head to head

metric	LlamaIndex	Mastra
score	7	8
questions won	8	9

By assistant

LlamaIndex

assistant	score	named in, this week	usual spot, this week
ChatGPT	9	15% of answers	#5.7
Claude	2	5% of answers	#13.0
Gemini	18	42% of answers	#9.4
Perplexity	3	5% of answers	#7.0

Mastra

assistant	score	named in, this week	usual spot, this week
ChatGPT	5	10% of answers	#6.5
Claude	18	40% of answers	#9.1
Gemini	0	0% of answers
Perplexity	7	11% of answers	#4.5

Where they differ

Only LlamaIndex gets named for

What's the best way to give an AI agent memory across sessions?
What's the best platform to build an AI agent that connects to my company's data?
What's the best tool to build an AI agent that answers customer emails?

Only Mastra gets named for

What's the best tool for building multi-agent systems?
What's the best platform to build AI agents that use MCP tools?
What's the best AI agent builder in 2026?
What's the best tool to build an AI agent that browses the web and does research?

More comparisons

Not sold on either?

Scores count how often each assistant names a product, weighted by position. How the score works · Full AI agent builders leaderboard