DeepSeek V4 Flash vs GPT Realtime 2
DeepSeek V4 Flash and GPT Realtime 2 are both current production-tier models. DeepSeek V4 Flash is meaningfully cheaper at $0.14 / $0.28 per 1M. DeepSeek V4 Flash has a 1M context window — about 8× the 128k of GPT Realtime 2. DeepSeek V4 Flash leads on coding, reasoning, long-context retrieval.
Specs side by side
| Metric | DeepSeek DeepSeek V4 Flash | OpenAI GPT Realtime 2 |
|---|---|---|
| Input price (per 1M) | $0.14 | $4 |
| Output price (per 1M) | $0.28 | $24 |
| Context window | 1M tokens | 128k tokens |
| Speed tier | balanced | ultra |
| Open weights | Yes | No |
| EU region | No | Yes |
| Free tier | OpenRouter | No |
| Prompt caching | Yes | No |
| Vision input | No | No |
| Extended thinking | Yes | No |
When to choose each
Choose DeepSeek V4 Flash if…
- Cost is a priority ($0.14 / $0.28 per 1M vs $4 / $24 per 1M)
- You need 1M context (8× more than GPT Realtime 2)
- You need open weights for self-hosting or fine-tuning
- You want a free tier for prototyping
- Coding is central to your workload
- Reasoning is central to your workload
Choose GPT Realtime 2 if…
- Low latency matters (ultra vs balanced)
- EU data residency is required
- You need realtime speech-to-speech
Benchmark delta
DeepSeek V4 Flash leads on
- Coding
- Reasoning
- Long-context retrieval
GPT Realtime 2 leads on
GPT Realtime 2 has no meaningful benchmark lead in this pair.
FAQ — DeepSeek V4 Flash vs GPT Realtime 2
DeepSeek V4 Flash vs GPT Realtime 2 — which is better?
DeepSeek V4 Flash and GPT Realtime 2 are both current production-tier models. DeepSeek V4 Flash is meaningfully cheaper at $0.14 / $0.28 per 1M. DeepSeek V4 Flash has a 1M context window — about 8× the 128k of GPT Realtime 2. DeepSeek V4 Flash leads on coding, reasoning, long-context retrieval. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does DeepSeek V4 Flash pricing compare to GPT Realtime 2?
DeepSeek V4 Flash costs $0.14 / $0.28 per 1M vs GPT Realtime 2 at $4 / $24 per 1M. DeepSeek V4 Flash is cheaper on output tokens by roughly 8471%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does DeepSeek V4 Flash or GPT Realtime 2 have the bigger context window?
DeepSeek V4 Flash has a 1M-token context window — 8× the 128k context of GPT Realtime 2. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for DeepSeek V4 Flash or GPT Realtime 2?
DeepSeek V4 Flash: yes — Often available free via OpenRouter; official API is extremely cheap ($0.14 cache miss, $0.0028 cached input). GPT Realtime 2: no — Paid-only.
Which is better for coding — DeepSeek V4 Flash or GPT Realtime 2?
DeepSeek V4 Flash leads on coding benchmarks (DeepSeek V4 Flash: 89/100, GPT Realtime 2: 78/100). For production coding agents also weigh tool-use performance — DeepSeek V4 Flash scores 84, GPT Realtime 2 scores 84.