Gemini 2.5 Flash Live API vs GPT-5.2 Codex
Gemini 2.5 Flash Live API (2025) and GPT-5.2 Codex (2025) compare a standalone API model against a coding-specialized model. Gemini 2.5 Flash Live API ships a 128k-token context window, while GPT-5.2 Codex ships a 400k-token context window. On pricing, Gemini 2.5 Flash Live API costs $0.50/1M input tokens versus $1.75/1M for the alternative. This page treats the result as workflow and deployment fit, not a universal model winner.
Treat this as a product-type comparison: Gemini 2.5 Flash Live API is standalone API model, while GPT-5.2 Codex is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Flash Live API | GPT-5.2 Codex |
|---|---|---|
| Product type | Standalone API model | Coding-specialized model |
| Best for | multimodal apps and tool-calling agents | custom coding agents, code generation, and tool loops |
| Decision fit | RAG, Agents, and Long context | Coding, RAG, and Agents |
| Context window | 128k | 400k |
| Cheapest output | $2/1M tokens | $14/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Gemini 2.5 Flash Live API has the lower cheapest tracked output price at $2/1M tokens.
- Local decision data tags Gemini 2.5 Flash Live API for RAG, Agents, and Long context.
- GPT-5.2 Codex has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.2 Codex has broader tracked provider coverage for fallback and route flexibility.
- GPT-5.2 Codex uniquely exposes Reasoning, Structured outputs, and Code execution in local model data.
- Local decision data tags GPT-5.2 Codex 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 2.5 Flash Live API
$900
Cheapest tracked route/tier: Google AI Studio
GPT-5.2 Codex
$4,900
Cheapest tracked route/tier: Vercel AI Gateway
Estimated monthly gap: $4,000. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Gemini 2.5 Flash Live API and GPT-5.2 Codex; plan for SDK, billing, or endpoint changes.
- GPT-5.2 Codex is $12/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.2 Codex adds Reasoning, Structured outputs, and Code execution in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.2 Codex and Gemini 2.5 Flash Live API; plan for SDK, billing, or endpoint changes.
- Gemini 2.5 Flash Live API is $12/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, Structured outputs, and Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-01 | 2025-12-18 |
| Context window | 128k | 400k |
| 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 | 2025-01 | 2025-08 |
Pricing and availability
| Pricing attribute | Gemini 2.5 Flash Live API | GPT-5.2 Codex |
|---|---|---|
| Input price | $0.50/1M tokens | $1.75/1M tokens |
| Output price | $2/1M tokens | $14/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Flash Live API | GPT-5.2 Codex |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | Yes | 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.
Continue comparing
Popular comparisons for Gemini 2.5 Flash Live API
Popular comparisons for GPT-5.2 Codex
Last reviewed: 2026-06-30. Data sourced from public model cards and provider documentation.