Gemini 3.5 Flash API Pricing
Gemini 3.5 Flash has tracked API rates of $1.50 per 1M input tokens and $9.00 per 1M output tokens. Cached input is billed at $0.15 per 1M tokens. Rates are in USD from the AI IQ dataset; see the Gemini 3.5 Flash model profile for capability scores.
Price List
| Rate | Price (USD) | Notes |
|---|---|---|
| Input | $1.50 | per 1M tokens |
| Output | $9.00 | per 1M tokens |
| Cached input (read) | $0.15 | per 1M tokens |
| Blended input + output | $10.50 | 1M in + 1M out at list price |
| Context window | 1M tokens |
Pricing References and Billing Caveats
These are the tracked rates, not a live quote. Hosted-provider choice, region, long-context tiers, caching, batch discounts, and temporary promotions can change the actual bill. Open-weight availability does not mean hosted inference is free. Workload examples assume the listed standard input and output rates, with no cache hits or discounts.
Google pricing catalog — check current offerings and rate tiers. This catalog may not list historical models or third-party hosted endpoints.
No model-specific official reference is recorded for this entry. Confirm the current rates directly with your inference provider.
What a Workload Costs
Computed straight from the list prices above — token counts are illustrative workload sizes, not measurements of Gemini 3.5 Flash.
| Workload | Cost | Tokens |
|---|---|---|
| Short chat turn | $0.00600 | 1K in / 500 out |
| Summarize a long document | $0.168 | 100K in / 2K out |
| Agentic coding session | $1.65 | 500K in / 100K out |
| 1M input + 1M output tokens | $10.50 | 1M in / 1M out |
Effective Cost
In AI IQ's scoring, Gemini 3.5 Flash's list price is adjusted by a token-usage multiplier of 0.862 (measured from real benchmark runs), giving an effective cost of $9.05 per 1M input + output tokens. That places it #108 of 153 models on the effective-cost ranking (lower is cheaper). Some models spend far more tokens than others on the same task, so effective cost compares what a unit of work really costs. Method details are on the methodology page; see all models on the cost charts and the falling cost of intelligence over time.
Cheaper Alternatives at Similar Capability
Models with a lower effective cost that score within a few IQ points of Gemini 3.5 Flash (IQ 120), or better.
| Model | Provider | IQ | Effective Cost / 1M |
|---|---|---|---|
| gpt-6.1-sol | OpenAI | 141 | $6.29 |
| Gemini 3.8 Flash | 130 | $7.98 | |
| Muse Spark 1.3 | Meta | 128 | $8.38 |
| DeepSeek V4.1 Flash 1017 | DeepSeek | 127 | $3.24 |
| gemini-3.7-flash | 127 | $5.94 | |
| DeepSeek V4.1 Flash | DeepSeek | 126 | $1.87 |