Google GeminiGemini 2.5 ProvsOpenAIGPT-4 Turbo: API Pricing Comparison & Performance Calculator

Every prompt, document, and system message costs input tokens. Google Gemini Gemini 2.5 Pro is $1.25 per million input tokens. OpenAI GPT-4 Turbo is $10. For read-heavy workloads, Google Gemini Gemini 2.5 Pro wins. If you process huge documents daily, that gap adds up fast—pick Google Gemini Gemini 2.5 Pro over OpenAI GPT-4 Turbo when quality is similar. Use our calculator above to see exact input costs.

Output tokens are what the model generates. They are usually pricier than input. Google Gemini Gemini 2.5 Pro charges $5 per million output tokens; OpenAI GPT-4 Turbo charges $30. For long answers, code, or reports, favor Google Gemini Gemini 2.5 Pro. Tight prompts ("answer in one paragraph") cut spend on either side. Our calculator helps you estimate these output costs accurately.

Context is how much text fits in one request. Google Gemini Gemini 2.5 Pro allows up to 2,000,000 tokens. OpenAI GPT-4 Turbo allows up to 128,000. Google Gemini Gemini 2.5 Pro fits longer docs or repos—but you pay for every token you send, every turn. Do not max the window unless you need it. In plain words: Very large — whole codebases or book-scale text in one shot (watch cost). For the other side: Standard for chat + medium docs; chunk bigger sources.

Gemini 2.5 Pro supports vision (about $0.00722 per image in our catalog). GPT-4 Turbo is text-only here. Resize images before the API when you can—it lowers token load and cost.

Reusing the same long context? Caching can slash input cost. Gemini 2.5 Pro does not show a cached rate in our data. GPT-4 Turbo does not show a cached rate here. Great for chat over one big PDF or policy doc.

If you do not need instant replies, batch jobs often run at a steep discount (often around half off list price, depending on the provider). Ship a file of requests, get results within about a day. Ideal for summaries, translations, and backfills. Use the calculator toggles above to see how batch mode changes your estimate.

Chats repeat system prompts and history every turn. A short user message can still bill thousands of input tokens. Lower input price helps—Google Gemini Gemini 2.5 Pro is usually safer for high-volume chat. On our speed hints, Google Gemini Gemini 2.5 Pro is 50/100 (Fast (latency-friendly)) and OpenAI GPT-4 Turbo is 0/100 (Moderate / variable). If one is clearly ahead on both price and speed hint, that is a nice combo for live chat—but slow networks or huge prompts can still swamp the difference, so try a realistic thread in your region.

Extraction needs accuracy and often a large context for messy PDFs. Try both Google Gemini Gemini 2.5 Pro and OpenAI GPT-4 Turbo on real samples. If quality matches, pick the cheaper input side—extraction is usually input-heavy.

Coding rewards reliability over saving a few cents. Bad output costs engineer time. Our coding-strength hints (again, heuristics) put Google Gemini Gemini 2.5 Pro at 88/100 and OpenAI GPT-4 Turbo at 0/100, with broader “smarts” hints at 87/100 vs 0/100. Between this pair, favor whichever passes your tests on your stack traces and style rules; if quality is a tie, output price leans toward Google Gemini Gemini 2.5 Pro for long patches.

System prompts ride along on every call. Example: 1,000 tokens × 100,000 requests per day ≈ 100M input tokens daily. At $1.25 per million for Google Gemini Gemini 2.5 Pro, that is about $125.00 per day from the system prompt alone. Keep instructions short and reusable.

RAG sends retrieved chunks with each question. More chunks mean more input tokens to Google Gemini Gemini 2.5 Pro or OpenAI GPT-4 Turbo. Tighten retrieval: send only the best few passages, not whole folders.

Long prompts tax you every request. Fine-tuning costs upfront but can shorten prompts. Compare total cost in our calculator: long prompt + cheap base model vs short prompt + fine-tuned pricing if you use it.

Agents may call Google Gemini Gemini 2.5 Pro or OpenAI GPT-4 Turbo many times per user task. One workflow can equal dozens of normal chat turns. Cap steps, log spend, and alert on spikes.

Bill clients for API usage you resell. Use Agency Mode in the calculator for markup, client price, and margin—plus PDFs for proposals.

Flat plans get burned by power users on Google Gemini Gemini 2.5 Pro or OpenAI GPT-4 Turbo. Credits or BYOK (bring your own key) align revenue with cost.

Dashboards, alerts, and tools like Helicone or Langfuse show who burns tokens and which prompts bloat bills. Measure before you optimize.

Beyond this pair, consider OpenAI GPT-4o, Anthropic Claude 3.5 Sonnet, or Google Gemini Gemini 1.5 Pro for price or capability fit. Design your stack so you can swap models without a rewrite.

List prices keep falling, but workloads get heavier—bigger contexts, agents, more tools. Net spend can still climb. Keep a running estimate whenever you change models or traffic.

Cost is not everything. Gemini 2.5 Pro carries a speed hint of 50/100 (Fast (latency-friendly)); GPT-4 Turbo is 0/100 (Moderate / variable).Flash and mini tiers optimize for low latency per dollar. Heavier per-token cost profile than GPT-4o for many teams. In production you still want time-to-first-token and tokens per second on your prompts, region, and concurrency—especially for voice, typing indicators, or anything that feels “live.”

Check training, retention, and region rules for each provider behind Gemini 2.5 Pro and GPT-4 Turbo. Regulated data needs enterprise terms, not guesswork.

Proprietary APIs are simple but price-controlled. Open models (e.g. Llama family) add ops work but can cut unit cost at scale. Match the tradeoff to your team.

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