Gemini 3.5 Flash vs Gemini 3.8 Live Extended Thinking
Pricing verdict: Gemini 3.5 Flash vs Gemini 3.8 Live Extended Thinking: Gemini 3.8 Live Extended Thinking is cheaper for input-heavy usage ($0.75/M vs $1.50/M input tokens), while Gemini 3.5 Flash is better for long-context tasks (1,000,000 tokens).
Direct answer: choose Gemini 3.8 Live Extended Thinking for lower token spend and choose Gemini 3.5 Flash when your workload needs longer context.
Compare API pricing, input and output token costs, context windows, and monthly estimates on one page so you can pick the right model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Gemini 3.5 Flash
Gemini 3.8 Live Extended Thinking
Cost Differences
Gemini 3.8 Live Extended Thinking costs less than Gemini 3.5 Flash
Quick Recommendation
Winner for direct API pricing: Gemini 3.8 Live Extended Thinking. At the default workload, Gemini 3.8 Live Extended Thinking saves about $9.00/month ($109.50/year) versus Gemini 3.5 Flash.
Feature Comparison
| Feature | Gemini 3.5 Flash | Gemini 3.8 Live Extended Thinking |
|---|---|---|
| Provider | ||
| Input Price | $1.50/1M tokens | $0.75/1M tokens |
| Output Price | $9.00/1M tokens | $4.50/1M tokens |
| Context Window | 1,000,000 tokens | 131,072 tokens |
| Max Output | 65,536 tokens | 65,536 tokens |
| Category | flagship | reasoning |
| Capabilities | textvisionaudiovideocodereasoning | textvisionaudiovideoreasoningstreaming |
| Release Date | 5/19/2026 | 9/15/2026 |
Gemini 3.5 Flash vs Gemini 3.8 Live Extended Thinking: Which Should You Choose?
Choosing between Gemini 3.5 Flash and Gemini 3.8 Live Extended Thinking depends on your priorities: cost efficiency, context length, or raw capability. Gemini 3.8 Live Extended Thinking is the more affordable option at $0.75/1M input tokens — 50% cheaper than Gemini 3.5 Flash. Meanwhile, Gemini 3.5 Flash offers a significantly larger context window at 1,000,000 tokens vs 131,072 for Gemini 3.8 Live Extended Thinking.
These models target different tiers: Gemini 3.5 Flash is a flagship model while Gemini 3.8 Live Extended Thinking is reasoning. This means they're optimized for different workloads. Gemini 3.5 Flash is built for complex tasks that require deeper reasoning, while Gemini 3.8 Live Extended Thinking offers better value for routine operations.
Output costs matter too. Gemini 3.5 Flash charges $9.00/1M output tokens vs $4.50 for Gemini 3.8 Live Extended Thinking. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Gemini 3.8 Live Extended Thinking has the edge here at $4.50/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Gemini 3.5 Flash when:
- • You need a larger context window (1,000,000 tokens)
- • You're already using Google's API ecosystem
Choose Gemini 3.8 Live Extended Thinking when:
- • Budget is a primary concern
- • You're already using Google's API ecosystem
Pros and Caveats at a Glance
Gemini 3.5 Flash
- • Input pricing: $1.50/M tokens
- • Output pricing: $9.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 65,536 tokens
Watch out for
- • Higher input cost than Gemini 3.8 Live Extended Thinking
- • Higher output cost than Gemini 3.8 Live Extended Thinking
Gemini 3.8 Live Extended Thinking
- • Input pricing: $0.75/M tokens
- • Output pricing: $4.50/M tokens
- • Context window: 131,072 tokens
- • Max output: 65,536 tokens
Watch out for
- • Smaller context window than Gemini 3.5 Flash
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Gemini 3.5 Flash (Google)
Gemini 3.8 Live Extended Thinking (Google)
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Which is cheaper, Gemini 3.5 Flash or Gemini 3.8 Live Extended Thinking?▼
What is the context window difference between Gemini 3.5 Flash and Gemini 3.8 Live Extended Thinking?▼
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