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Head to head · Assistant proactive · October 2026 research run

Gemini Spark vs Hermes Agent

Hermes Agent scores 67.9 (B) on agent readiness against Gemini Spark's 24.5 (F), and leads in every scored category. Both do assistant proactive.

Best AI personal assistants that act for one person · All 190 assistants comparisons

Gemini SparkGoogle LLC · Platform F24.5/100#974 of 986 Hermes AgentNous Research · Agent harness B67.9/100#244 of 986

Which one, for what

Gemini Spark F

Best for A person who already keeps mail, calendar and files in a personal Google Account and accepts Keep Activity being on.

Also in its favour

  • No incidents deducted, where Hermes Agent loses 3 points for them

Watch for

No public API, SDK or MCP server for an outside agent was found. Spark is reached in the Gemini mobile app, the Mac app and gemini.google.com

Hermes Agent B

Best for A technical owner who wants one always-on agent across chat apps with memory and scheduled jobs, on their own machine or a small server, with any model.

Ahead on

  • Reliability, 57 against 14
  • Schema & documentation, 80 against 17
  • Agent ergonomics, 80 against 9
  • Security & auth, 75 against 60
  • Payments & pricing, 60 against 10
  • Maintenance & community, 84 against 17
  • Transparency & trust, 63 against 49

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • Open source

Watch for

The default terminal backend runs commands on the host, and the default smart mode lets an auxiliary model approve commands it rates low-risk

Score by category

CategoryWeight this runGemini SparkHermes AgentEdge
Reliability16%201457Hermes Agent +43
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21780Hermes Agent +63
Agent ergonomics13%16.2980Hermes Agent +71
Security & auth14%17.56075Hermes Agent +15
Payments & pricing10%12.51060Hermes Agent +50
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81784Hermes Agent +67
Transparency & trust7%8.84963Hermes Agent +14
Negative events≤150-3
TotalF 24.5/100B 67.9/100

Facts side by side

FactGemini SparkHermes Agent
KindPlatformAgent harness
VendorGoogle LLCNous Research
Hosted endpointno (local only)no (local only)
Transports
AuthOAuthNone
PricingPaidFree
x402nono
LicenceProprietary hosted service under the Google Terms of ServiceMIT
Read-only variant documentednono
llms.txtnoyes
Last release2026-05-192026-10-11
Terms last updated2026-07-30no document linked
Privacy policy last updated2026-09-24no document linked
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularitynone253k stars

Verdicts

Gemini Spark

Google's help pages state what Spark confirms before doing, how to delete its remote browser and code data, and the risks of prompt injection. Spark has no public API, Google calls it experimental, and it runs only with Keep Activity on, the setting under which chats are used for model training and human review.

Hermes Agent

Card payments always ask first and are refused in unattended sessions, and the messaging gateway denies every sender until an allowlist is set. Shell commands run on the host by default with a model judging risk, and sending mail through the Google Workspace skill is held back only by an instruction to the model.

Before you call either

Gemini Spark

  1. Do not plan an integration against Spark. No public API or MCP server was found, and a person must hold a Google AI Pro or Ultra subscription
  2. Expect a confirmation request before sends, edits, purchases and web form submissions, and note that bulk changes to private Google Tasks run without one
  3. Delete remote browser data and remote code execution data in Gemini Spark Settings after a sensitive session. Deleting a task thread or Gemini Apps activity does not remove them
  4. Keep within 15 running tasks and 50 active schedules. A schedule does not run when 15 tasks are running or the usage limit is reached
  5. Treat every safety statement here as Google's own description. None was tested, and no message was sent to the service

Hermes Agent

  1. Set approvals.mode: manual before giving it real accounts. The default smart lets an auxiliary model approve commands
  2. Run the gateway with terminal.backend: docker or the project's Docker image when it reads mail, web pages or group chats
  3. Set memory.write_approval: true and skills.write_approval: true to review what it saves about the owner
  4. Leave approvals.cron_mode and approvals.unattended_mode at deny for scheduled and webhook runs
  5. Set TELEGRAM_ALLOWED_USERS or the matching allowlist per channel. Never set GATEWAY_ALLOW_ALL_USERS=true

Questions

Which is better for AI agents, Gemini Spark or Hermes Agent?

Hermes Agent scores 67.9 (B) on agent readiness against Gemini Spark's 24.5 (F), and leads in every scored category.

Are Gemini Spark and Hermes Agent open source?

No open-source release is listed for Gemini Spark. Hermes Agent is open source (MIT).

Other comparisons with Gemini Spark or Hermes Agent

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