Claude Opus 4.6 (Fast) vs Gemini 3.1 Flash Lite Preview
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Claude Opus 4.6 (Fast) if you need
- ✓Choose Gemini 3.1 Flash Lite Preview if you need maximum output speed above 300 tokens per second.
- ✓Choose Gemini 3.1 Flash Lite Preview if you need unified handling of video, audio, and files beyond static images.
- ✓Choose Gemini 3.1 Flash Lite Preview if you need the lowest cost at $1.5 per million output tokens.
- ✓Choose Gemini 3.1 Flash Lite Preview if you need a slightly larger 1,048,576-token context window for document and media tasks.
Choose Gemini 3.1 Flash Lite Preview if you need
- ✓Choose Claude Opus 4.6 (Fast) if you need higher intelligence at 52.9 index and stronger reasoning depth.
- ✓Choose Claude Opus 4.6 (Fast) if you need safety-conscious responses and conservative output style.
- ✓Choose Claude Opus 4.6 (Fast) if you need effective large-context handling with proven stability over preview models.
Verdict
Claude Opus 4.6 (Fast) leads in intelligence with a 52.9 index versus Gemini's 33.5, delivering stronger reasoning depth for complex tasks. Gemini 3.1 Flash Lite Preview dominates on speed at 310.24 t/s versus 40.23 t/s, price at $1.5/M versus $150/M, and native multimodal breadth including video and audio. Context windows are nearly identical, with Gemini's 1,048,576 tokens edging out Claude's 1,000,000.
Claude Opus 4.6 (Fast) vs Gemini 3.1 Flash Lite Preview: side by side
| Spec | Claude Opus 4.6 (Fast) | Gemini 3.1 Flash Lite Preview | Winner |
|---|---|---|---|
| Intelligence | 52.9 | 33.5 | Claude Opus 4.6 (Fast) |
| Output speed | 40 t/s | 310 t/s | Gemini 3.1 Flash Lite Preview |
| Output price | $150.00/1M | $1.50/1M | Gemini 3.1 Flash Lite Preview |
| Context | 1000K | 1049K | Gemini 3.1 Flash Lite Preview |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Anthropic | Tie |
Detailed analysis
Intelligence
Winner: Claude Opus 4.6 (Fast)Claude Opus 4.6 (Fast) scores 52.9 on the intelligence index compared to Gemini 3.1 Flash Lite Preview's 33.5. This gap aligns with Claude's listed strength in strong reasoning depth versus Gemini's focus on efficiency.
Speed
Winner: Gemini 3.1 Flash Lite PreviewGemini 3.1 Flash Lite Preview outputs at 310.24 tokens per second while Claude Opus 4.6 (Fast) reaches only 40.23 t/s. Gemini's lightweight design is explicitly optimized for speed, outweighing Claude's fast inference claim within its class.
Pricing
Winner: Gemini 3.1 Flash Lite PreviewGemini 3.1 Flash Lite Preview costs $1.5 per million output tokens versus Claude Opus 4.6 (Fast) at $150 per million. The 100x price difference makes Gemini the clear choice for high-volume workloads.
Multimodal Capabilities
Winner: Gemini 3.1 Flash Lite PreviewGemini supports broad native modalities including video, audio, and files, while Claude's vision is limited to static images. Both handle large contexts near 1M tokens, but Gemini's unified media support provides wider coverage.
Claude Opus 4.6 (Fast)
Pros
- +Strong reasoning depth
- +Effective large-context handling
- +Safety-conscious responses
- +Fast inference for its class
Cons
- –May refuse borderline requests
- –Conservative output style
- –Vision limited to static images
Gemini 3.1 Flash Lite Preview
Pros
- +Broad native support for multiple modalities
- +Very large context window for document and media tasks
- +Lightweight design optimized for speed
- +Unified handling of video, audio and files
Cons
- –Preview model may show inconsistent behavior
- –Lite variant trades depth for efficiency
- –Experimental features can be less reliable than stable releases
Summary: Claude Opus 4.6 (Fast) vs Gemini 3.1 Flash Lite Preview
Select Gemini 3.1 Flash Lite Preview for speed-critical, cost-sensitive, or multi-format media workloads. Choose Claude Opus 4.6 (Fast) when maximum reasoning intelligence and safety alignment matter most. The models trade off depth against efficiency and breadth.
Frequently asked questions
Neither is universally better; Claude Opus 4.6 (Fast) leads in intelligence while Gemini 3.1 Flash Lite Preview leads in speed, price, and multimodal range.