GPT-5 vs Gemini 3 Flash
OpenAI's flagship model against Google's budget speedster. Gemini 3 Flash is 60% cheaper on input and 70% cheaper on output — with 3.7× more context. See which fits your workload.
Pricing data verified: 2026-06-20
| Specification | GPT-5 (OpenAI) | Gemini 3 Flash (Google) |
|---|---|---|
| Input Price (per 1M tokens) | $1.25 | $0.500 |
| Output Price (per 1M tokens) | $10.00 | $3.00 |
| Context Window | 272K | 1M |
| Tier | Premium | Budget |
| Provider | OpenAI |
Calculate Your Exact Costs
See how the costs stack up for your specific usage pattern.
Other Models to Consider
Which Model for Which Use Case?
High-Volume Chatbots
Gemini 3 Flash's 70% cheaper output makes it the clear winner for chatbots handling thousands of daily conversations. Same 1M context, fraction of the cost.
Complex Reasoning Tasks
GPT-5's advanced reasoning capabilities may justify the premium for tasks requiring multi-step logic, nuanced analysis, or sophisticated function calling.
Long Document Processing
Gemini 3 Flash's 1M token context window (3.7× GPT-5's 272K) handles longer documents, larger codebases, and more extended conversations in a single pass.
Enterprise Integration
GPT-5 integrates with OpenAI's full ecosystem: Assistants API, function calling, fine-tuning, and enterprise compliance. If you're on OpenAI infra, staying may be simpler.
Comparing OpenAI and Google?
APIpulse Pro lets you compare all 42 models, find the cheapest option for your exact usage, and save scenarios for your team.
Frequently Asked Questions
Is GPT-5 cheaper than Gemini 3 Flash?
No. Gemini 3 Flash is significantly cheaper: $0.50/M input (60% cheaper than GPT-5's $1.25/M) and $3.00/M output (70% cheaper than GPT-5's $10.00/M). Gemini also has a larger 1M context window vs GPT-5's 272K.
When would I choose GPT-5 over Gemini 3 Flash?
Choose GPT-5 if you need OpenAI's ecosystem (function calling, Assistants API, fine-tuning), prefer US-based infrastructure, or need GPT-5's specific reasoning capabilities. GPT-5 excels at complex multi-step tasks.
Which model has a better context window?
Gemini 3 Flash has a 1M token context window — 3.7× larger than GPT-5's 272K. For long documents, codebases, or extended conversations, Gemini handles significantly more context.
Can Gemini 3 Flash match GPT-5 quality?
For most tasks like chatbots, content generation, and classification, Gemini 3 Flash delivers comparable quality at 60-70% less cost. GPT-5 may have an edge on complex reasoning and nuanced tasks.