Nano Banana Pro (Gemini 3 Pro Image Preview) vs GPT-6 Astra Pro
Nano Banana Pro (Gemini 3 Pro Image Preview) costs 4.2x less per output token than GPT-6 Astra Pro ($12.00 vs $50.00 per million). Updated October 22, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $12.00
- Coding
- No data
- Overall
- No data
- Output $/M
- $50.00
Nano Banana Pro (Gemini 3 Pro Image Preview) or GPT-6 Astra Pro: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Nano Banana Pro (Gemini 3 Pro Image Preview) for output tokens 4.2x cheaper ($12.00 vs $50.00 per million).
No benchmark has tested both yet. Nano Banana Pro (Gemini 3 Pro Image Preview) has results on Design Arena: images, Design Arena: graphic design and Design Arena: logos; GPT-6 Astra Pro on WeirdML and Chess puzzles. Compare them on price and context instead.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Image generation
Design Arena: images
No call
Only Nano Banana Pro (Gemini 3 Pro Image Preview) has a Design Arena: images result, 1216.
Directional only
Long documents
Listed context window
GPT-6 Astra Pro
GPT-6 Astra Pro takes 1.05M tokens against 66K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Nano Banana Pro (Gemini 3 Pro Image Preview)
Nano Banana Pro (Gemini 3 Pro Image Preview) $0.0080, GPT-6 Astra Pro $0.035 per turn.
List prices
At a glance
- Coding index
- Nano Banana Pro (Gemini 3 Pro Image Preview) not benchmarked, GPT-6 Astra Pro not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- Nano Banana Pro (Gemini 3 Pro Image Preview) $12.00 against GPT-6 Astra Pro $50.00 per million output tokens, 4.2x apart.
- Context window
- Nano Banana Pro (Gemini 3 Pro Image Preview) takes 66K tokens, GPT-6 Astra Pro 1.05M.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
| Benchmark | Nano Banana Pro (Gemini 3 Pro Image Preview) | GPT-6 Astra Pro | Leader |
|---|---|---|---|
| WeirdML | Not measured | 93.6% | Only GPT-6 Astra Pro measured |
| Neither model has a result on the other 38 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | Nano Banana Pro (Gemini 3 Pro Image Preview) | GPT-6 Astra Pro | Leader |
|---|---|---|---|
| Chess puzzles | Not measured | 76.0% | Only GPT-6 Astra Pro measured |
| Neither model has a result on the other 21 boards here | |||
Image generationDirectional onlyPublic boards, shown as published, kept out of the index5 boards measured
| Benchmark | Nano Banana Pro (Gemini 3 Pro Image Preview) | GPT-6 Astra Pro | Leader |
|---|---|---|---|
| Design Arena: images | 1216 | Not measured | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| Design Arena: graphic design | 1226 | Not measured | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| Design Arena: logos | 1181 | Not measured | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| LMArena Text to Image | 1234 | Not measured | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
| LMArena Image Edit | 1385 | Not measured | Only Nano Banana Pro (Gemini 3 Pro Image Preview) measured |
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Nano Banana Pro (Gemini 3 Pro Image Preview) costs less
Repository review
50K input + 3K output tokens
Nano Banana Pro (Gemini 3 Pro Image Preview) costs less
Agent loop
200K input + 10K output tokens
Nano Banana Pro (Gemini 3 Pro Image Preview) costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Google Nano Banana Pro (Gemini 3 Pro Image Preview) | OpenAI GPT-6 Astra Pro |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | November 20, 2025 | September 4, 2026 |
| Context window | 66K | 1.05M |
| Input $/Mtok | $2.00 | $10.00 |
| Output $/Mtok | $12.00 | $50.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Nano Banana Pro (Gemini 3 Pro Image Preview) better than GPT-6 Astra Pro for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Nano Banana Pro (Gemini 3 Pro Image Preview) for output tokens 4.2x cheaper ($12.00 vs $50.00 per million).
Which is cheaper, Nano Banana Pro (Gemini 3 Pro Image Preview) or GPT-6 Astra Pro?
Nano Banana Pro (Gemini 3 Pro Image Preview) costs $2.00 per million input tokens and $12.00 per million output tokens; GPT-6 Astra Pro costs $10.00 and $50.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Nano Banana Pro (Gemini 3 Pro Image Preview) or GPT-6 Astra Pro?
GPT-6 Astra Pro, with 1.05M tokens against 66K.
Has any benchmark tested both Nano Banana Pro (Gemini 3 Pro Image Preview) and GPT-6 Astra Pro?
No benchmark has tested both yet. Nano Banana Pro (Gemini 3 Pro Image Preview) has results on Design Arena: images, Design Arena: graphic design and Design Arena: logos; GPT-6 Astra Pro on WeirdML and Chess puzzles. Compare them on price and context instead. Data as of October 22, 2026.