Cheaper overall
GPT-5.4 Nano
69% lower blended rate
Higher benchmark scores
Gemini 3.8 Flash
leads on 10 of 11 figures
Bigger context window
Gemini 3.8 Flash
1,048,576 vs 400,000 tokens
Cheaper cached input
GPT-5.4 Nano
$0.02 vs $0.075, 73% less
Where each one wins
Gemini 3.8 Flash
- Larger context window 1,048,576 tokens
- Higher overall intelligence (Intelligence Index) 40.9 vs 20.7
- Higher coding ability (Coding Index) 76.3 vs 56.1
- Higher multi-step tool use (Agentic Index) 40.2 vs 16
- Ahead on 7 more benchmark figures
GPT-5.4 Nano
- Cheaper input tokens $0.20 vs $0.75, 73% less
- Cheaper output tokens $1.25 vs $3.75, 67% less
- Cheaper cached input $0.02 vs $0.075, 73% less
- Cheaper on all four workloads
- Longer maximum output 128,000 tokens
- Higher answer reliability (Omniscience Non-Hallucination) 48.9 vs 44.8
- Offers Batch and Flex pricing not listed for Gemini 3.8 Flash
What four workloads cost
One run, and the same run a thousand times.
GPT-5.4 Nano is cheaper on all four workloads, by much the same margin each time — about 3.4 times, from $0.0008 against $0.0026 on a chat turn to $0.0838 against $0.3113 on a long document.
| Workload | Gemini 3.8 Flash | GPT-5.4 Nano | ×1,000 | Difference |
|---|---|---|---|---|
| Chat turn 1,000 in / 500 out | $0.0026 | $0.0008 | $2.63 / $0.8250 | GPT-5.4 Nano is 69% cheaper |
| RAG answer 10,000 in / 800 out | $0.0105 | $0.0030 | $10.50 / $3.00 | GPT-5.4 Nano is 71% cheaper |
| Agent loop 32,000 in / 700 out × 20 calls | $0.1275 | $0.0375 | $127.50 / $37.50 | GPT-5.4 Nano is 71% cheaper |
| Long document 400,000 in / 3,000 out | $0.3113 | $0.0838 | $311.25 / $83.75 | GPT-5.4 Nano is 73% cheaper |
Price per 1M tokens
Above 272,000 input tokens the rates change, and the new rate applies to the whole request, not just the tokens past that point. It does not change which of the two is cheaper.
| Context band | Price | Gemini 3.8 Flash | GPT-5.4 Nano | Difference |
|---|---|---|---|---|
| Prompts up to 272,000 tokens | Input | $0.75 | $0.20 | GPT-5.4 Nano is 73% cheaper |
| Prompts up to 272,000 tokens | Cached input | $0.075 | $0.02 | GPT-5.4 Nano is 73% cheaper |
| Prompts up to 272,000 tokens | Output | $3.75 | $1.25 | GPT-5.4 Nano is 67% cheaper |
| Prompts over 272,000 tokens | Input | $0.75 | $0.20 | GPT-5.4 Nano is 73% cheaper |
| Prompts over 272,000 tokens | Cached input | $0.075 | $0.02 | GPT-5.4 Nano is 73% cheaper |
| Prompts over 272,000 tokens | Output | $3.75 | $1.25 | GPT-5.4 Nano is 67% cheaper |
Blended: Gemini 3.8 Flash $1.50, GPT-5.4 Nano $0.4625 per 1M — one rate at 3:1 input to output, for comparing two models at a glance.
Gemini 3.8 Flash priced by Perplexity, GPT-5.4 Nano by OpenAI. Standard tier, pay-as-you-go.
Other pricing tiers
Only GPT-5.4 Nano lists Batch and Flex, at up to 50% off its own standard rate; Gemini 3.8 Flash offers none of them.
Every tier either model sells is here, so this is the whole price sheet. A saving is measured against that model's own standard rate — how we read tiers.
| Tier | Gemini 3.8 Flash | GPT-5.4 Nano | Cheaper |
|---|---|---|---|
| Batch only on GPT-5.4 Nano | Not offered | $0.10 in / $0.625 out 50% off Standard | — |
| Flex only on GPT-5.4 Nano | Not offered | $0.10 in / $0.625 out 50% off Standard | — |
Benchmarks
They share 11 figures: Gemini 3.8 Flash leads on 10, GPT-5.4 Nano on 1. The widest gap is 28.9 points, on factual accuracy (Omniscience Accuracy).
Overall intelligence
Intelligence Index — Overall intelligence across reasoning, knowledge & math evals
Gemini 3.8 Flash ahead by 20.2
Coding ability
Coding Index — Coding ability across software-engineering evals
Gemini 3.8 Flash ahead by 20.2
Multi-step tool use
Agentic Index — Tool use & multi-step agent task performance
Gemini 3.8 Flash ahead by 24.2
Graduate-level science
GPQA Diamond — Graduate-level questions in biology, chemistry & physics
Gemini 3.8 Flash ahead by 13.6
Expert-exam performance
Humanity's Last Exam — Expert-level questions across many academic domains
Gemini 3.8 Flash ahead by 19.5
Long-context reasoning
AA-LCR — Long-context reasoning across large inputs
Gemini 3.8 Flash ahead by 4.6
Scientific coding
SciCode — Research-level scientific coding tasks
Gemini 3.8 Flash ahead by 9.4
Physics research reasoning
CritPt — Unpublished physics research reasoning problems
Gemini 3.8 Flash ahead by 9
Real-world task performance
GDPval — Economically valuable, real-world knowledge work
Gemini 3.8 Flash ahead by 23.8
Factual accuracy
Omniscience Accuracy — Breadth of factual knowledge across domains
Gemini 3.8 Flash ahead by 28.9
Answer reliability
Omniscience Non-Hallucination — How reliably the model avoids fabricated answers
GPT-5.4 Nano ahead by 4.1
Each figure is that model's best published run, with the effort level named beside it — where these scores come from.
Specifications
Gemini 3.8 Flash holds 648,576 more input tokens in one request. Gemini 3.8 Flash also takes audio and video.
| Specification | Gemini 3.8 Flash | GPT-5.4 Nano |
|---|---|---|
| Context window | 1,048,576 tokens | 400,000 tokens |
| Max output | 65,536 tokens | 128,000 tokens |
| Takes in | Text, audio, image, video, file | Text, image, file |
| Puts out | Text | Text |
| Knowledge cutoff | — | 31 Aug 2025 |
| Released | 2 Sep 2026 | 17 Mar 2026 |
| Status | Active | Active |
| Sold by | Perplexity | OpenAI, Perplexity |
FAQs
- Is Gemini 3.8 Flash cheaper than GPT-5.4 Nano?
- No — the other way round. A 1,000-token prompt with a 500-token reply costs $0.0026 on Gemini 3.8 Flash and $0.0008 on GPT-5.4 Nano, and the same model is cheaper on every workload on this page.
- How much do Gemini 3.8 Flash and GPT-5.4 Nano cost per 1M tokens?
- Gemini 3.8 Flash costs $0.75 for input and $3.75 for output. GPT-5.4 Nano costs $0.20 and $1.25. Standard pay-as-you-go rates, as of 10 Sep 2026.
- Which is better, Gemini 3.8 Flash or GPT-5.4 Nano?
- On published benchmarks, Gemini 3.8 Flash. It leads on 10 of the 11 figures both models report, including overall intelligence (Intelligence Index), where it scores 40.9 against 20.7.
- Does Gemini 3.8 Flash or GPT-5.4 Nano offer batch pricing?
- GPT-5.4 Nano only. Its batch input costs $0.10, 50% off its standard rate, and Gemini 3.8 Flash lists no batch tier at all.
- Does Gemini 3.8 Flash or GPT-5.4 Nano have a bigger context window?
- Gemini 3.8 Flash, at 1,048,576 tokens against 400,000. That is 648,576 more input tokens in a single request.