Gemini 3.5 Flash vs Sonar Reasoning Pro
At a Glance
| Compare |  Gemini 3.5 FlashGoogle DeepMind |  Sonar Reasoning ProPerplexity |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #15 of 4672.1 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #25 of 44$0.140 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #15 of 3856.8 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.50Google AI ↗ · Aug 29, 2026 | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $9.00Google AI ↗ · Aug 29, 2026 | $8.00Openrouter ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | 1,049K | 128K |
| Model facts checked | Aug 29, 2026View model evidence → | Aug 29, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Gemini 3.5 Flash | Sonar Reasoning Pro |
|---|---|---|
| Developer | Google DeepMind | Perplexity |
| Family | Gemini 3 | Sonar |
| Model | Gemini 3.5 Flash | Sonar Reasoning Pro |
| Version | Gemini 3.5 Flash | Sonar Reasoning Pro |
| Lifecycle | active | active |
| Released | Unknown | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text, Image, Video, Audio, Document | Text |
| Output modalities | Text | Text |
| Context window | 1,049K | 128K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Google AI (Standard), Google Gemini (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, citations, reasoning, search |
Gemini 3.5 Flash Capabilities
Sonar Reasoning Pro Capabilities
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Primary Evidence
Sources and Freshness
Questions
Gemini 3.5 Flash vs Sonar Reasoning Pro FAQs
Is Gemini 3.5 Flash or Sonar Reasoning Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Gemini 3.5 Flash and Sonar Reasoning Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Gemini 3.5 Flash or Sonar Reasoning Pro?+
Gemini 3.5 Flash is $1.50 and Sonar Reasoning Pro is $2.00 per million tokens, so Gemini 3.5 Flash is cheaper on this metric. Gemini 3.5 Flash is $9.00 and Sonar Reasoning Pro is $8.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric.
Which has a larger context window, Gemini 3.5 Flash or Sonar Reasoning Pro?+
Gemini 3.5 Flash has the larger sourced context window. Gemini 3.5 Flash supports 1,049K and Sonar Reasoning Pro supports 128K.
Which performs better in benchmarks, Gemini 3.5 Flash or Sonar Reasoning Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Gemini 3.5 Flash or Sonar Reasoning Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Gemini 3.5 Flash is not marked open weight; Sonar Reasoning Pro is not marked open weight.
Can Gemini 3.5 Flash and Sonar Reasoning Pro understand images?+
Gemini 3.5 Flash is documented with image input; Sonar Reasoning Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Gemini 3.5 Flash or Sonar Reasoning Pro?+
Neither has a larger sourced maximum output. Gemini 3.5 Flash is 66K and Sonar Reasoning Pro is —.
Do Gemini 3.5 Flash and Sonar Reasoning Pro support reasoning and tool use?+
Gemini 3.5 Flash: reasoning, tool calling, and image input. Sonar Reasoning Pro: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, Gemini 3.5 Flash or Sonar Reasoning Pro?+
Gemini 3.5 Flash has 2 sourced provider routes; Sonar Reasoning Pro has 2, a tie.
Which offers better value, Gemini 3.5 Flash or Sonar Reasoning Pro?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.