GPT-5.4 vs DeepSeek V4 Flash

Comprehensive comparison of OpenAI's GPT-5.4 and DeepSeek's DeepSeek V4 Flash. Pricing, specs, benchmarks, use cases, and recommendations.

Quick Verdict

Overall Value
DeepSeek V4 Flash
Best Context
GPT-5.4
92% cheaperBest Value
G
GPT-5.4
OpenAI
$2.50 / $15.00
D
DeepSeek V4 Flash
DeepSeek
$0.27 / $1.10

Overview

GPT-5.4 (OpenAI) and DeepSeek V4 Flash (DeepSeek) represent two different approaches to AI. GPT-5.4 is a gpt5-class model with 256K context, priced at $2.50/$15.00 per 1M tokens. DeepSeek V4 Flash is a deepseek-class model with 128K context, priced at $0.27/$1.10 per 1M tokens.

Balanced performance and cost. The recommended model for most production workloads.. Fast, cost-effective DeepSeek model. The best choice for high-volume production use with excellent price-performance.. Both are available through AI API Hub with USDT and USDC payments — no credit card required.

At current pricing, using DeepSeek V4 Flash saves you approximately Save $2.23 per 1M input tokens versus the other, making it the more budget-friendly choice for high-volume applications.

Cost Calculator

GPT-5.4
$10.00
/month
DeepSeek V4 Flash
$0.82
/month
💡 DeepSeek V4 Flash saves $9.18/month (92%) vs GPT-5.4

Technical Specifications Comparison

SpecificationGPT-5.4DeepSeek V4 Flash
ProviderOpenAIDeepSeek
Release Date2026-052026-05
Context Window256K128K
Max Output Tokens16,38432,768
Input Price$2.50/1M$0.27/1M
Output Price$15.00/1M$1.10/1M
VisionYes ✓No
AudioNoNo
Function CallingYes ✓No
JSON ModeYes ✓No
StreamingYes ✓Yes ✓
Fine TuningYes ✓No
Rate Limits10K RPM10K RPM
Statusactiveactive

Pros & Cons

GPT-5.4

Advantages
  • ✓Excellent performance
  • ✓Lower cost than 5.5
  • ✓Daily workhorse
Limitations
  • ✗Not the latest frontier
  • ✗Higher cost than DeepSeek

DeepSeek V4 Flash

Advantages
  • ✓Fast & affordable
  • ✓Great value
  • ✓Good coding
  • ✓Ideal for production
Limitations
  • ✗Weaker than v4-pro on reasoning
  • ✗Smaller context

Benchmarks

BenchmarkGPT-5.4DeepSeek V4 Flash
MMLUN/AN/A
GPQAN/AN/A
SWE-benchN/AN/A
HumanEvalN/AN/A
GSM8KN/AN/A
MATHN/AN/A
MMMUN/AN/A
Benchmark scores are not publicly available for most models. We list official scores when published by the provider.

Best For

Use CaseGPT-5.4DeepSeek V4 Flash
Coding★★★★
AI Agents★★★★★
Research★★
Writing★★★★★★
Enterprise★★★★

Performance & Pricing Analysis

Performance: GPT-5.4 delivers excellent performance with 256K context. DeepSeek V4 Flash delivers fast & affordable with 128K context. Both models serve different audiences — GPT-5.4 targets excellent performance and lower cost than 5.5, while DeepSeek V4 Flash targets fast & affordable and great value.

Pricing: At $2.50/$15.00 vs $0.27/$1.10 per 1M tokens, DeepSeek V4 Flash is the more affordable choice. For a typical workload of 1M requests/month at 1K tokens input and 500 tokens output, DeepSeek V4 Flash saves approximately $9.18/month.

Recommendation: Choose DeepSeek V4 Flash if you prioritize cost-efficiency. Both models are available through AI API Hub with USDT/USDC payments and instant activation. Start with $5 and access all models through one API key.

How to Switch Between Models

Since both GPT-5.4 and DeepSeek V4 Flash 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.

Python — Switch from GPT-5.4 to DeepSeek V4 Flash
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-5.4", messages=[...])
# After:  response = client.chat.completions.create(model="deepseek-v4-flash", messages=[...])
Node.js — Switch from GPT-5.4 to DeepSeek V4 Flash
import OpenAI from "openai";
const client = new OpenAI({apiKey: process.env.KEY, baseURL: "https://api.apiyihe.org/v1"});
// Before: model: "gpt-5.4"
// After:  model: "deepseek-v4-flash"
cURL — Switch from GPT-5.4 to DeepSeek V4 Flash
curl https://api.apiyihe.org/v1/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -d '{"model": "deepseek-v4-flash", "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-5.4 and DeepSeek V4 Flash?

GPT-5.4 is OpenAI's gpt5 model with 256K context at $2.50/1M input. DeepSeek V4 Flash is DeepSeek's deepseek model with 128K context at $0.27/1M input. They serve different ecosystems — access both through AI API Hub with one key.

Which model is cheaper?

DeepSeek V4 Flash is cheaper at $0.27/1M input vs $2.50/1M for GPT-5.4. You save $2.23 per 1M input tokens with DeepSeek V4 Flash.

Which model is better for coding?

Coding capabilities vary by model. Check the features section above for details.

Which model has a larger context window?

GPT-5.4 has a larger context window (256K vs 128K) — $100% more capacity.

Can both models use function calling?

Function calling support varies. GPT-5.4 supports it. DeepSeek V4 Flash does not support it.

How much does GPT-5.4 cost?

GPT-5.4 costs $2.50/1M input tokens and $15.00/1M output tokens with 256K context. Pay-as-you-go, no minimum. Sign up at AI API Hub and start with $5.

How much does DeepSeek V4 Flash cost?

DeepSeek V4 Flash costs $0.27/1M input tokens and $1.10/1M output tokens with 128K context. Pay-as-you-go, no minimum. Sign up at AI API Hub and start with $5.

Which model is better for enterprise use?

Neither model targets the premium enterprise tier exclusively. For enterprise needs, consider flagship models with higher quality guarantees.

Which model is better for AI agents?

Agent capabilities vary. Check the function calling support in the specs table above.

How do I access these APIs?

Access both GPT-5.4 and DeepSeek V4 Flash through AI API Hub: (1) Register at api.apiyihe.org/register?aff=8JZC, (2) Deposit USDT/USDC, (3) Get your API key, (4) Use OpenAI-compatible endpoint https://api.apiyihe.org/v1 with model names "gpt-5.4" or "deepseek-v4-flash". One API key gives access to all models.

Can I switch between these models without changing my code?

Yes. Since AI API Hub uses an OpenAI-compatible API format, switching from GPT-5.4 to DeepSeek V4 Flash (or vice versa) only requires changing the model parameter. All other code — SDK initialization, message format, streaming — remains identical.

Which model has better latency?

DeepSeek V4 Flash typically has faster response times due to its optimized architecture. GPT-5.4 may have higher latency on complex reasoning tasks. Use the cost calculator above to estimate costs at your volume.

Related Models

GPT-5.5$5.00/1MGPT-4.1$2.00/1MGPT-4.1 Mini$0.40/1MDeepSeek V4 Pro$0.55/1MDeepSeek Chat$0.27/1MDeepSeek V3.2$0.23/1M

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