Migrating from gemini-3.1-flash-tts-preview to gemini-3.8-flash-tts
What changes when you move from gemini-3.1-flash-tts-preview to gemini-3.8-flash-tts: input price −50%, output price −55%.
- Status
- Deprecated
- Shutdown
- Nov 17, 2026 at the earliest
- Time left
- 33 days
- Status
- Active
- Shutdown
- none announced
- Time left
- —
Prices
USD per 1M tokens, standard tier| Type | gemini-3.1-flash-tts-preview | gemini-3.8-flash-tts | Change |
|---|---|---|---|
| Input | $1.00first seen October 1, 2026 · source | $0.50first seen October 1, 2026 · source | −50% |
| Output | $20.00first seen October 1, 2026 · source | $9.00first seen October 1, 2026 · source | −55% |
At 1M input and 250K output tokens a month: $6.00 on gemini-3.1-flash-tts-preview, $2.75 on gemini-3.8-flash-tts (−54.2%).
Other tiers, prompt-size bands and modalities are on each model's page.
Limits
Tokens| Limit | gemini-3.1-flash-tts-preview | gemini-3.8-flash-tts | Change |
|---|---|---|---|
| Context window | 8,192 tokensin place when tracking began (October 6, 2026) · source | 8,192 tokensin place when tracking began (October 6, 2026) · source | 0% |
| Max output tokens | 16,384 tokensin place when tracking began (October 6, 2026) · source | 16,384 tokensin place when tracking began (October 6, 2026) · source | 0% |
Features and parameters
Compare modelsSame on both
- Structured outputs: not supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: in place when tracking began (October 6, 2026) · source
- Function calling: not supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: in place when tracking began (October 6, 2026) · source
- Prompt caching: not supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: first seen October 10, 2026 · source
- Batch API: supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: in place when tracking began (October 6, 2026) · source
- Reasoning / thinking: not supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: in place when tracking began (October 6, 2026) · source
- Built-in web search: not supported on both.gemini-3.1-flash-tts-preview: in place when tracking began (October 6, 2026) · source · gemini-3.8-flash-tts: in place when tracking began (October 6, 2026) · source
Not published for gemini-3.1-flash-tts-preview: Image input, PDF input, Fine-tuning, temperature parameter, top_p parameter, logprobs.
Not published for gemini-3.8-flash-tts: Image input, PDF input, Fine-tuning, temperature parameter, top_p parameter, logprobs.
Free tier
gemini-3.1-flash-tts-preview: Free tier, in place when tracking began (October 7, 2026) (source)
gemini-3.8-flash-tts: Free tier, in place when tracking began (October 7, 2026) (source) · All free models
Aliases
All aliasesNo aliases point at either model.
Checklist
- Change the model string from
gemini-3.1-flash-tts-previewtogemini-3.8-flash-tts.
Compared from AIWire's published data when this page loaded. Each fact links to the page it came from. Model pages: gemini-3.1-flash-tts-preview, gemini-3.8-flash-tts.