Claude Opus 4.8 (Fast) vs Gemini 3.5 Flash
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 4.8 (Fast) if you need
- ✓high output speed above 190 t/s and low cost at $9 per million tokens
- ✓maximum context window of 1,048,576 tokens for large multimodal inputs
- ✓strong multimodal integration across text, image, video, and audio
- ✓fast, efficient processing where depth can be traded for velocity
Choose Gemini 3.5 Flash if you need
- ✓highest intelligence index of 55.7 with nuanced and careful reasoning
- ✓strong safety alignment and high-quality writing or analysis
- ✓effective handling of 1M-token contexts with reliable large-context performance
- ✓tasks where cautious, high-quality outputs outweigh raw speed
Verdict
Gemini 3.5 Flash leads on speed, price, and a marginally larger context window while delivering strong multimodal versatility, whereas Claude Opus 4.8 (Fast) leads on intelligence index and nuanced reasoning with stronger safety alignment. Gemini is the efficiency choice for high-volume multimodal tasks; Claude is the quality choice when careful analysis matters more than throughput.
Claude Opus 4.8 (Fast) vs Gemini 3.5 Flash: side by side
| Spec | Claude Opus 4.8 (Fast) | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| Intelligence | 55.7 | 45.4 | Claude Opus 4.8 (Fast) |
| Output speed | 65 t/s | 193 t/s | Gemini 3.5 Flash |
| Output price | $50.00/1M | $9.00/1M | Gemini 3.5 Flash |
| Context | 1000K | 1049K | Gemini 3.5 Flash |
| Params | — | — | Tie |
| Provider | Anthropic | Tie |
Detailed analysis
Intelligence
Winner: Claude Opus 4.8 (Fast)Claude Opus 4.8 (Fast) scores 55.7 on the intelligence index compared with Gemini 3.5 Flash at 45.4. Its listed strengths emphasize nuanced reasoning and high-quality analysis, while Gemini trades depth for speed on complex tasks.
Speed
Winner: Gemini 3.5 FlashGemini 3.5 Flash outputs at 192.61 tokens per second versus Claude Opus 4.8 (Fast) at 65.39 t/s. Gemini's strengths explicitly highlight high speed and efficiency; Claude notes that its fast mode may trade some depth for speed.
Pricing
Winner: Gemini 3.5 FlashGemini 3.5 Flash is priced at $9 per million output tokens while Claude Opus 4.8 (Fast) costs $50 per million. The tenfold price difference favors Gemini for high-volume multimodal workloads.
Context & Multimodal
Winner: Gemini 3.5 FlashGemini offers 1,048,576 tokens of context versus Claude's 1,000,000 and lists strong multimodal integration across four data types. Claude lists effective large-context handling but notes multimodal performance varies with image clarity.
Claude Opus 4.8 (Fast)
Pros
- +Strong safety alignment
- +Nuanced and careful reasoning
- +Effective large-context handling
Cons
- –Can be overly cautious on edge cases
- –Multimodal performance varies with image clarity
- –Fast mode may trade some depth for speed
Gemini 3.5 Flash
Pros
- +High speed and efficiency
- +Strong multimodal integration
- +Large context window support
Cons
- –Trades depth for speed on complex tasks
- –Variable performance on specialized domains
- –Context utilization depends on task
Summary: Claude Opus 4.8 (Fast) vs Gemini 3.5 Flash
Choose Gemini 3.5 Flash when speed, cost, and broad multimodal throughput are priorities. Choose Claude Opus 4.8 (Fast) when higher intelligence, safety, and careful reasoning outweigh the slower speed and higher price.
Frequently asked questions
Neither is universally better: Gemini 3.5 Flash wins on speed and price while Claude Opus 4.8 (Fast) wins on intelligence index and nuanced reasoning.