Nano Banana Pro (Gemini 3 Pro Image) vs GPT-5.3-Codex
Nano Banana Pro (Gemini 3 Pro Image) (2026) and GPT-5.3-Codex (2026) compare a standalone API model against a coding-specialized model. Nano Banana Pro (Gemini 3 Pro Image) ships a 66k-token context window, while GPT-5.3-Codex ships a 400k-token context window. On pricing, GPT-5.3-Codex costs $1.75/1M input tokens versus $2/1M 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: Nano Banana Pro (Gemini 3 Pro Image) is standalone API model, while GPT-5.3-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 | Nano Banana Pro (Gemini 3 Pro Image) | GPT-5.3-Codex |
|---|---|---|
| Product type | Standalone API model | Coding-specialized model |
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | custom coding agents, code generation, and tool loops |
| Decision fit | Agents, Vision, and JSON / Tool use | Coding, RAG, and Agents |
| Context window | 66k | 400k |
| Cheapest output | $120/1M tokens | $14/1M tokens |
| Provider routes | 1 tracked | 3 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Nano Banana Pro (Gemini 3 Pro Image) uniquely exposes Multimodal in local model data.
- Local decision data tags Nano Banana Pro (Gemini 3 Pro Image) for Agents, Vision, and JSON / Tool use.
- GPT-5.3-Codex has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.3-Codex has the lower cheapest tracked output price at $14/1M tokens.
- GPT-5.3-Codex has broader tracked provider coverage for fallback and procurement flexibility.
- GPT-5.3-Codex uniquely exposes Function calling and Code execution in local model data.
- Local decision data tags GPT-5.3-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.
Nano Banana Pro (Gemini 3 Pro Image)
$31,600
Cheapest tracked route/tier: Google AI Studio
GPT-5.3-Codex
$4,900
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $26,700. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Nano Banana Pro (Gemini 3 Pro Image) and GPT-5.3-Codex; plan for SDK, billing, or endpoint changes.
- GPT-5.3-Codex is $106/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Multimodal before moving production traffic.
- GPT-5.3-Codex adds Function calling and Code execution in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.3-Codex and Nano Banana Pro (Gemini 3 Pro Image); plan for SDK, billing, or endpoint changes.
- Nano Banana Pro (Gemini 3 Pro Image) is $106/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Function calling and Code execution before moving production traffic.
- Nano Banana Pro (Gemini 3 Pro Image) adds Multimodal in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-28 | 2026-02-05 |
| Context window | 66k | 400k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-01 | 2025-08 |
Pricing and availability
| Pricing attribute | Nano Banana Pro (Gemini 3 Pro Image) | GPT-5.3-Codex |
|---|---|---|
| Input price | $2/1M tokens | $1.75/1M tokens |
| Output price | $120/1M tokens | $14/1M tokens |
| Providers |
Capabilities
| Capability | Nano Banana Pro (Gemini 3 Pro Image) | GPT-5.3-Codex |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| Function calling | No | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on multimodal input: Nano Banana Pro (Gemini 3 Pro Image), function calling: GPT-5.3-Codex, and code execution: GPT-5.3-Codex. Both models share vision, reasoning mode, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Nano Banana Pro (Gemini 3 Pro Image) lists $2/1M input and $120/1M output tokens on the cheapest tracked provider, while GPT-5.3-Codex lists $1.75/1M input and $14/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-5.3-Codex lower by about $31.97 per million blended tokens. Availability is 1 providers versus 3, so concentration risk also matters.
Choose Nano Banana Pro (Gemini 3 Pro Image) when vision-heavy evaluation are central to the workload. Choose GPT-5.3-Codex when coding workflow support, larger context windows, and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.
FAQ
Which has a larger context window, Nano Banana Pro (Gemini 3 Pro Image) or GPT-5.3-Codex?
GPT-5.3-Codex supports 400k tokens, while Nano Banana Pro (Gemini 3 Pro Image) supports 66k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Nano Banana Pro (Gemini 3 Pro Image) or GPT-5.3-Codex?
GPT-5.3-Codex is cheaper on tracked token pricing. Nano Banana Pro (Gemini 3 Pro Image) costs $2/1M input and $120/1M output tokens. GPT-5.3-Codex costs $1.75/1M input and $14/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Nano Banana Pro (Gemini 3 Pro Image) or GPT-5.3-Codex open source?
Nano Banana Pro (Gemini 3 Pro Image) is listed under Proprietary. GPT-5.3-Codex is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Nano Banana Pro (Gemini 3 Pro Image) or GPT-5.3-Codex?
Both Nano Banana Pro (Gemini 3 Pro Image) and GPT-5.3-Codex expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Nano Banana Pro (Gemini 3 Pro Image) or GPT-5.3-Codex?
Nano Banana Pro (Gemini 3 Pro Image) has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Nano Banana Pro (Gemini 3 Pro Image) and GPT-5.3-Codex?
Nano Banana Pro (Gemini 3 Pro Image) is available on Google AI Studio. GPT-5.3-Codex is available on OpenRouter, OpenAI API, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-31. Data sourced from public model cards and provider documentation.