AiGanakGPT-6.1 Terra vs Gemini 3.8 Flash: API pricing
Gemini 3.8 Flash is cheaper: a typical support answer costs $0.00367 against $0.00470 on GPT-6.1 Terra at list prices checked 26 October 2026. Gemini 3.8 Flash rises to $1.50 / $7.50 per million tokens on 1 January 2027, which makes the same answer $0.00735.
GPT-6.1 Terra: $1 input / $5 output per 1M tokens. Gemini 3.8 Flash: $0.75 / $3.75.
Prices side by side
Sources: OpenAI, Google, checked 26 October 2026. Full details: GPT-6.1 Terra · Gemini 3.8 Flash.
| GPT-6.1 Terra | Gemini 3.8 Flash | |
|---|---|---|
| Input | $1 | $0.75 |
| Cached input | $0.05 | $0.075 |
| Output | $5 | $3.75 |
| Batch input / output | $0.5 / $2.50 | $0.375 / $1.88 |
| Cache write | $1.25 | not charged separately |
| Long prompts | Prompts over 272K input tokens cost 2x input and cache rates and 1.5x output for the whole request. | No long-prompt surcharge listed |
| Announced change | None announced | $1.50 / $7.50 from 1 January 2027 |
Cost per request
Token counts are stated so you can check the arithmetic.
| Task | Tokens | GPT-6.1 Terra | Gemini 3.8 Flash |
|---|---|---|---|
| Chat reply | 2,000 input tokens, none cached, 300-token reply | $0.00350 | $0.00263 |
| Support answer | 6,000 input tokens (4,000 cached instructions and help text), 500-token answer | $0.00470 | $0.00367 |
| Document summary | 20,000-token document, no caching, 800-token summary | $0.024 | $0.018 |
Monthly cost of support answers
| Answers per month | GPT-6.1 Terra | Gemini 3.8 Flash | Difference |
|---|---|---|---|
| 10,000 | $47.00 | $36.75 | $10.25 |
| 100,000 | $470 | $368 | $103 |
| 1,000,000 | $4,700 | $3,675 | $1,025 |
Price per token is only part of the story: the model that answers in fewer tokens, or needs fewer retries, can be cheaper in practice. Test both on your own requests before switching.
GPT-6.1 Terra vs Gemini 3.8 Flash: pricing questions
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Is GPT-6.1 Terra cheaper than Gemini 3.8 Flash?
Gemini 3.8 Flash is cheaper: a typical support answer costs $0.00367 against $0.00470 on GPT-6.1 Terra at list prices checked 26 October 2026. Gemini 3.8 Flash rises to $1.50 / $7.50 per million tokens on 1 January 2027, which makes the same answer $0.00735.
How much more does GPT-6.1 Terra cost than Gemini 3.8 Flash?
For a support answer with 6,000 input tokens (4,000 cached) and a 500-token reply, GPT-6.1 Terra costs 1.3× more than Gemini 3.8 Flash: $4.70 against $3.67 per 1,000 answers.
What do GPT-6.1 Terra and Gemini 3.8 Flash cost with batch processing?
Batch prices per million tokens: GPT-6.1 Terra $0.5 input / $2.50 output, Gemini 3.8 Flash $0.375 / $1.88. Batch requests return within 24 hours.
Should I switch from GPT-6.1 Terra to Gemini 3.8 Flash?
Only if quality holds on your own examples. Price per token is one factor; how many tokens each model uses for your task, and how often its answers need a retry, decide the real cost. Test both on 50 to 100 real requests before switching.
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