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Google: Gemini 2.5 Flash (batch) vs Moondream: Moondream 3.1

Neither wins outright: Google: Gemini 2.5 Flash (batch) is the pick when cost matters at scale, Moondream: Moondream 3.1 when you want the newer model.

Key numbers

SpecGoogle: Gemini 2.5 Flash (batch)Moondream: Moondream 3.1
ProviderGoogleMoondream
Input price (per 1M tokens)$0.15$0.30
Output price (per 1M tokens)$1.25$2.50
Blended price (3:1 input/output)$0.42$0.85
Cheaper than … of all models we track57%43%
Context window1.0M tokens (~1,573 pages)32K tokens (~48 pages)
Larger context than … of all models81%5%
Max output per response66K tokens (~49,200 words)4K tokens (~3,100 words)
Input typesfile, image, text, audio, videotext, image
Output typestexttext
Free variantNoNo
Listed since2025-06-172026-10-15

What it costs for real workloads

Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.

Workload (per month)Google: Gemini 2.5 Flash (batch)Moondream: Moondream 3.1Difference
Customer-support chatbot
50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens)
$36.25$72.50Google: Gemini 2.5 Flash (batch) saves $36.25
RAG search over documents
20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens)
$30.50$61.00Google: Gemini 2.5 Flash (batch) saves $30.50
Coding / tool-using agent
2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens)
$33.00Doesn't fit context—
Batch summarisation
10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens)
$19.50$39.00Google: Gemini 2.5 Flash (batch) saves $19.50
Long-document analysis
500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens)
$8.75Doesn't fit context—

Capabilities side by side

CapabilityGoogle: Gemini 2.5 Flash (batch)Moondream: Moondream 3.1What it lets you do
Tool / function calling✓ Yes—call your APIs and run agent loops
Structured output (JSON schema)✓ Yes—return JSON that validates against your schema
Reasoning / thinking mode✓ Yes✓ Yesspend extra tokens thinking before answering hard problems
Image input✓ Yes✓ Yesread screenshots, charts and scanned pages
Audio input✓ Yes—take speech or audio directly
File / PDF input✓ Yes—accept documents without your own parsing step
Image output——generate images, not just text
Built-in web search✓ Yes—answer from live web results
Seed (reproducible sampling)✓ Yes—repeat a generation for tests and evals
Log-probabilities——read token confidence for classification and scoring

From each model's published parameters and input/output types. “—” means not advertised, not proven absent.

Price history

Which should you choose?

Choose Google: Gemini 2.5 Flash (batch) if…

  • cost matters at scale — it is 50% cheaper on a typical 3:1 input/output mix ($36.25 vs $72.50 a month for 50,000 support chats)
  • you need to fit long inputs in one request — 1.0M tokens is roughly 1,573 pages, against 48
  • you need tool / function calling — to call your APIs and run agent loops; Moondream: Moondream 3.1 does not advertise it
  • you need structured output (JSON schema) — to return JSON that validates against your schema; Moondream: Moondream 3.1 does not advertise it
  • you need audio input — to take speech or audio directly; Moondream: Moondream 3.1 does not advertise it
  • you need file / PDF input — to accept documents without your own parsing step; Moondream: Moondream 3.1 does not advertise it
  • you need built-in web search — to answer from live web results; Moondream: Moondream 3.1 does not advertise it
  • you need seed (reproducible sampling) — to repeat a generation for tests and evals; Moondream: Moondream 3.1 does not advertise it
  • you generate long outputs in one go — up to 66K tokens (about 49,200 words) per response

Choose Moondream: Moondream 3.1 if…

  • you want the newer model — released 2026-10-15, 16 months after the other

Frequently asked questions

Is Google: Gemini 2.5 Flash (batch) better than Moondream: Moondream 3.1?

Neither wins outright: Google: Gemini 2.5 Flash (batch) is the pick when cost matters at scale, Moondream: Moondream 3.1 when you want the newer model. In short: Google: Gemini 2.5 Flash (batch) when cost matters at scale, you need to fit long inputs in one request, you need tool / function calling, you need structured output (JSON schema), you need audio input, you need file / PDF input, you need built-in web search, you need seed (reproducible sampling), you generate long outputs in one go; Moondream: Moondream 3.1 when you want the newer model.

Which is cheaper, Google: Gemini 2.5 Flash (batch) or Moondream: Moondream 3.1?

Google: Gemini 2.5 Flash (batch) is cheaper: $0.42 vs $0.85 per 1M tokens at a typical 3:1 input/output mix, 50% less. For 50,000 support conversations a month that is $36.25 against $72.50.

How much do Google: Gemini 2.5 Flash (batch) and Moondream: Moondream 3.1 cost per million tokens?

Google: Gemini 2.5 Flash (batch) costs $0.15 per 1M input tokens and $1.25 per 1M output tokens; Moondream: Moondream 3.1 costs $0.30 input and $2.50 output. Output tokens are billed separately, so long answers shift the gap.

Which has the bigger context window, Google: Gemini 2.5 Flash (batch) or Moondream: Moondream 3.1?

Google: Gemini 2.5 Flash (batch): 1.0M tokens, about 1,573 pages, against 32K (about 48 pages) for Moondream: Moondream 3.1.

Do Google: Gemini 2.5 Flash (batch) and Moondream: Moondream 3.1 support function calling and JSON output?

Tool calling — Google: Gemini 2.5 Flash (batch): yes, Moondream: Moondream 3.1: not advertised. JSON-schema structured output — Google: Gemini 2.5 Flash (batch): yes, Moondream: Moondream 3.1: not advertised.

Can Google: Gemini 2.5 Flash (batch) or Moondream: Moondream 3.1 read images?

Yes, both accept image input.

Is Google: Gemini 2.5 Flash (batch) or Moondream: Moondream 3.1 free to use?

No free variant is listed for either; both are pay-per-token.

What is the maximum output length of Google: Gemini 2.5 Flash (batch) and Moondream: Moondream 3.1?

Google: Gemini 2.5 Flash (batch) can write up to 66K tokens (about 49,200 words) per response; Moondream: Moondream 3.1 up to 4K (about 3,100 words).

When were Google: Gemini 2.5 Flash (batch) and Moondream: Moondream 3.1 released?

Google: Gemini 2.5 Flash (batch) was listed on 2025-06-17; Moondream: Moondream 3.1 on 2026-10-15.

About the two models

Compare Google: Gemini 2.5 Flash (batch) with other models

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Compare Moondream: Moondream 3.1 with other models

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