Amazon Bedrock AgentCore vs Mastra

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

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Amazon Bedrock AgentCore and Mastra both sit near the bottom of the pack, with overall scores of 9 and 8 out of 100. AgentCore is named in 15 of 71 answers versus Mastra's 12 of 71, and it shows up most for reliability and production questions, like 3 of 4 answers on "most reliable platform to run AI agents in production." Mastra leans more toward developer-framework questions, appearing in 2 of 3 answers for "which AI agent framework should a developer choose" and "best tool for building multi-agent systems." Head-to-head across shared questions, each tool leads in 5, with 10 ties. Neither is named for voice agents, non-technical founders, or self-hosting.

Head to head

metric	Amazon Bedrock AgentCore	Mastra
score	9	8
questions won	8	9

By assistant

Amazon Bedrock AgentCore

assistant	score	named in, this week	usual spot, this week
ChatGPT	12	15% of answers	#2.7
Claude	14	35% of answers	#14.3
Gemini	18	33% of answers	#7.0
Perplexity	2	5% of answers	#10.0

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 Amazon Bedrock AgentCore gets named for

What's the most reliable platform to run AI agents in production?
What's the best platform to build an AI agent that connects to my company's data?
What's the best no-code tool to build an AI agent?

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 are the best open-source AI agent frameworks?
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