GPT-4o Mini vs Llama 4 405B
A side-by-side look at OpenAI's GPT-4o Mini and Meta's Llama 4 405B — covering API pricing, context window, latency, coding ability, and real-world fit, so you can pick the right model for what you're building.
Quick Verdict
Cost optimization across both models
Access either model through one API key. Pay only for what you use — save up to 70% vs official pricing.
Overview
GPT-4o Mini and Llama 4 405B come from different camps — OpenAI versus Meta — and they split most sharply on price and context. GPT-4o Mini runs at $0.15/$0.60 per 1M tokens with a 128K window; Llama 4 405B sits at $1.30/$5.00 with 256K of context. Neither is objectively "better" — the right pick depends on what you're shipping.
In practice: Smallest GPT-4 class model. Good for simple tasks, chat, and cost-sensitive apps. Meta's largest open-weight model with 405 billion parameters. Near-frontier performance on reasoning and coding tasks. Available through AI API Hub with pay-as-you-go pricing. Both ship through AI API Hub on an OpenAI-compatible endpoint, so you can move between them by changing a single model name — and settle the bill with USDT or USDC, no credit card required.
On cost alone, GPT-4o Mini is the cheaper of the two (Save $1.15 per 1M input), which adds up fast once real traffic hits. Use the calculator below to model your own volume.
Interactive Cost Calculator
Deep Specs Matchup
| Specification | GPT-4o Mini | Llama 4 405B |
|---|---|---|
| Provider | OpenAI | Meta |
| Release Date | 2024-07 | 2026-05 |
| Context Window | 128K | 256K |
| Max Output Tokens | 16,384 | 32,768 |
| Input Price | $0.15/1M | $1.30/1M |
| Output Price | $0.60/1M | $5.00/1M |
| Vision Support | Yes ✓ — image input | Yes ✓ — image input |
| Audio Support | No | No |
| Function Calling / Tool Use | Yes ✓ | No |
| JSON Mode Support | Yes ✓ | No |
| Streaming | Yes ✓ | Yes ✓ |
| Fine Tuning | Yes ✓ | No |
| Rate Limits (RPM/TPM) | 10K RPM | 5K RPM |
| Latency P95 | N/A | N/A |
| Latency P99 | N/A | N/A |
| Status | active | active |
Latency P95/P99: Not publicly disclosed by provider — marked N/A to avoid fabrication. Rate limits shown as published by the provider; plan-dependent where N/A. All data sourced from model-variants.ts.
Pros & Cons Analysis
GPT-4o Mini
- ✓Cost efficiency — $0.15/1M input, ultra-low token cost
- ✓Tool use — function calling for AI agents
- ✓Multimodal — vision/image input supported
- ✗Limited reasoning depth
- ✗Not for complex analysis
Llama 4 405B
- ✓Multimodal — vision/image input supported
- ✓Open-weight
- ✓405B parameters
- ✗No function calling — limited for AI agents
- ✗Not fully open-source
Benchmark Scores
| Benchmark | GPT-4o Mini | Llama 4 405B |
|---|---|---|
| MMLU | N/A | N/A |
| HumanEval | N/A | N/A |
| SWE-bench | N/A | N/A |
| GSM8K | N/A | N/A |
| Arena Score | N/A | N/A |
E-E-A-T note: Benchmark data is sourced exclusively from official provider releases stored in our model registry. No estimated or inferred scores are shown.
🧠 Human Decision Summary
→If your workload involves long document reasoning or multi-step instruction following → Llama 4 405B performs better with its 256K context.
→If cost is your primary constraint → GPT-4o Mini provides ~88% lower cost per 1M tokens.
→If you need function-calling AI agents → GPT-4o Mini is the only option with tool use support.
These recommendations are derived from each model's capabilities and pricing in our registry — not hand-written per page.
🏆 Winner per Dimension
| Category | Winner | Reason |
|---|---|---|
| Coding | Tie | Native code generation + better price-performance |
| Long context | Llama 4 405B | Larger context window (256K) |
| Cost efficiency | GPT-4o Mini | Lower input price — $0.15/1M vs $1.30/1M |
| Reasoning | Llama 4 405B | Chain-of-thought / math specialization |
| Multimodal | Tie | Vision / image input support |
Real-world Use Cases
GPT-4o Mini
- Code generation agentFunction calling enables autonomous code workflows
- RAG knowledge assistant128K context for document retrieval
- Document summarization systemVision + long context for image-heavy documents
Llama 4 405B
- RAG knowledge assistant256K context for document retrieval
- Document summarization systemVision + long context for image-heavy documents
- Customer support automationQuality responses for support workflows
Best For
| Use Case | GPT-4o Mini | Llama 4 405B |
|---|---|---|
| Coding | ★ | ★★ |
| AI Agents | ★★★ | ★★ |
| Research | ★ | ★★★ |
| Writing | ★★★ | ★★★ |
| Enterprise | ★ | ★★ |
Performance & Pricing Analysis
On performance, GPT-4o Mini leans into ultra-cheap and pairs it with 128K of context — enough for ultra-cheap and fast. Llama 4 405B answers with open-weight across 256K, which makes it the stronger fit when you need open-weight and 405b parameters. The gap is real, but it's a question of fit rather than dominance.
Pricing is where they part ways. At $0.15/$0.60 versus $1.30/$5.00 per 1M tokens, GPT-4o Mini is the clear budget pick. Run a typical workload of 1M requests/month at ~1K input / 500 output tokens and GPT-4o Mini keeps roughly $3350.00/month in your pocket.
Our take: if cost efficiency drives the decision, GPT-4o Mini wins. Either way, both run through AI API Hub with USDT/USDC payments and instant activation — start with $5 and one API key covers every model.
How to Switch Between Models
Since both GPT-4o Mini and Llama 4 405B are available through AI API Hub with OpenAI-compatible API format, switching between them requires only changing the model name parameter. Your existing SDK code works without modification.
from openai import OpenAI client = OpenAI(api_key="YOUR_KEY", base_url="https://api.apiyihe.org/v1") # Before: response = client.chat.completions.create(model="gpt-4o-mini", messages=[...]) # After: response = client.chat.completions.create(model="llama-4-405b", messages=[...])
import OpenAI from "openai";
const client = new OpenAI({apiKey: process.env.KEY, baseURL: "https://api.apiyihe.org/v1"});
// Before: model: "gpt-4o-mini"
// After: model: "llama-4-405b"curl https://api.apiyihe.org/v1/chat/completions \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model": "llama-4-405b", "messages": [{"role":"user","content":"Hello"}]}'💡 AI API Hub supports both models through one API key. No separate accounts needed. Pay with USDT/USDC for all models.
Frequently Asked Questions
What is the difference between GPT-4o Mini and Llama 4 405B?
They come from different providers and optimize for different things. GPT-4o Mini is OpenAI's gpt4 model — 128K context, $0.15/1M input. Llama 4 405B is Meta's llama model — 256K context, $1.30/1M input. The short version: pick based on context size, price, and which capabilities your app actually needs.
Which model is cheaper?
GPT-4o Mini is cheaper at $0.15/1M input. At typical volumes that difference compounds — run the cost calculator above with your real request count to see the monthly gap.
Which model is better for coding?
Neither is a dedicated coding model. Check the features table above to see what each actually supports.
Which model has a larger context window?
Llama 4 405B wins on context — 256K versus 128K. That matters for long documents, large codebases, or multi-turn conversations that need to stay coherent.
Which model is faster?
GPT-4o Mini generally responds faster — lighter models tend to have lower latency, though Llama 4 405B may pull ahead on complex reasoning where its larger capacity helps. For latency-critical apps, benchmark both at your real workload.
Which model should I choose?
It depends on your priority. If cost drives the decision, go with GPT-4o Mini ($0.15/1M). If you need to process long documents or large contexts, Llama 4 405B and its 256K window is the safer bet. If you're building AI agents, GPT-4o Mini is your only tool-calling option here. When in doubt, start with the cheaper model and upgrade only if quality demands it.
Can both models use function calling?
Not equally. GPT-4o Mini supports function calling; Llama 4 405B does not. If agents are central to your app, that narrows the choice.
How much does GPT-4o Mini cost?
GPT-4o Mini runs $0.15/1M input and $0.60/1M output, with 128K of context. It's pay-as-you-go with no minimum — through AI API Hub you can start with $5 and scale up.
How much does Llama 4 405B cost?
Llama 4 405B runs $1.30/1M input and $5.00/1M output, with 256K of context. It's pay-as-you-go with no minimum — through AI API Hub you can start with $5 and scale up.
Which model is better for enterprise use?
Neither is exclusively enterprise-tier. For heavy enterprise use, look at the flagship options in each provider's lineup.
Which model is better for AI agents?
Agent support differs — see the function-calling answer above.
How do I access these APIs?
Both run through AI API Hub on one OpenAI-compatible endpoint. Register at api.apiyihe.org, deposit USDT or USDC (no credit card), grab your API key, and call https://api.apiyihe.org/v1 with model name "gpt-4o-mini" or "llama-4-405b". One key unlocks every model.
Can I switch between these models without changing my code?
Yes — because AI API Hub is OpenAI-compatible, moving from GPT-4o Mini to Llama 4 405B (or back) is just a model-name change. Your SDK setup, message format, and streaming logic stay exactly the same.
Final Verdict: Which Should You Buy?
💰 Cheapest pricing · ⚡ Instant API key · 🚫 No credit card · 💎 Pay with USDT/USDC · 🔌 OpenAI-compatible
Conclusion: GPT-4o Mini is the cheaper choice — save $3350.00/month (88%) at your volume. Buy GPT-4o Mini API for the cheapest pricing and instant API key.
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Access GPT-4o Mini & Llama 4 405B via AI API Hub
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