Gemini 3.1 Flash TTS Preview vs GPT-5.5
Gemini 3.1 Flash TTS Preview (2026) and GPT-5.5 (2026) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 3.1 Flash TTS Preview ships a 16k-token context window, while GPT-5.5 ships a 1.05m-token context window. On pricing, Gemini 3.1 Flash TTS Preview costs $1/1M input tokens; GPT-5.5 ranges from $5 to $8/1M input tokens by tier. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.5 fits 66x more tokens; pick it for long-context work and Gemini 3.1 Flash TTS Preview for tighter calls.
Decision scorecard
Local evidence first| Signal | Gemini 3.1 Flash TTS Preview | GPT-5.5 |
|---|---|---|
| Best for | general production evaluation | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | General | Coding, RAG, and Agents |
| Context window | 16k | 1.05m |
| Cheapest output | - | $30/1M tokens |
| Provider routes | 1 tracked | 4 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Use Gemini 3.1 Flash TTS Preview when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
- GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 has broader tracked provider coverage for fallback and route flexibility.
- GPT-5.5 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags GPT-5.5 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini 3.1 Flash TTS Preview
Unavailable
Cheapest tracked route/tier: Google AI Studio
GPT-5.5
$11,500
Cheapest tracked route/tier: OpenAI API 0-272K input tokens
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Gemini 3.1 Flash TTS Preview and GPT-5.5; plan for SDK, billing, or endpoint changes.
- GPT-5.5 adds Vision, Multimodal, and Reasoning in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.5 and Gemini 3.1 Flash TTS Preview; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-15 | 2026-04-23 |
| Context window | 16k | 1.05m |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | 2025-12 |
Pricing and availability
| Pricing attribute | Gemini 3.1 Flash TTS Preview | GPT-5.5 |
|---|---|---|
| Input price | $1/1M tokens |
|
| Output price | - |
|
| Providers |
Capabilities
| Capability | Gemini 3.1 Flash TTS Preview | GPT-5.5 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.