GPT-5.1-Codex vs DeepSeek Flash Latest: pricing comparison
DeepSeek Flash Latest is the cheaper option at $0.00/$2.40 per 1M input/output tokens — GPT-5.1-Codex ($1.25/$10) costs about 417x more per input token. Full spec-by-spec breakdown below.
| GPT-5.1-Codex | DeepSeek Flash Latest | |
|---|---|---|
| Input /1M tokens | $1.25 | $0.00 |
| Output /1M tokens | $10 | $2.40 |
| Cache read /1M | $0.13 | $0.00 |
| Context window | 400K | 1.0M |
| Provider | OpenAI | ~deepseek |
| Vision input | Yes | Yes |
| Released | Nov 2025 | Sep 2026 |
Real workload costs: GPT-5.1-Codex vs DeepSeek Flash Latest
Cost per single request at common token profiles — the cheapest model for each workload is highlighted.
| Workload | Tokens (in / out) | GPT-5.1-Codex | DeepSeek Flash Latest |
|---|---|---|---|
| Chatbot message | 500 / 300 | $0.0036 | $0.0007 |
| RAG query with context | 4,000 / 500 | $0.01 | $0.0012 |
| Document summarization | 20,000 / 1,000 | $0.04 | $0.0025 |
| Agent coding session | 100,000 / 5,000 | $0.17 | $0.01 |
Frequently asked questions
Which is cheaper: GPT-5.1-Codex vs DeepSeek Flash Latest?
DeepSeek Flash Latest is the cheapest on input tokens at $0.00 per 1M, and DeepSeek Flash Latest is cheapest on output at $2.40 per 1M. GPT-5.1-Codex costs about 417x more per input token than DeepSeek Flash Latest.
How much does GPT-5.1-Codex cost per 1M tokens?
GPT-5.1-Codex costs $1.25 per 1M input tokens and $10 per 1M output tokens on the OpenAI API, with a 400K-token context window.
How much does DeepSeek Flash Latest cost per 1M tokens?
DeepSeek Flash Latest costs $0.00 per 1M input tokens and $2.40 per 1M output tokens on the ~deepseek API, with a 1.0M-token context window.
What does a typical request cost on GPT-5.1-Codex vs DeepSeek Flash Latest?
For a typical request with 2,000 input and 500 output tokens: GPT-5.1-Codex costs $0.0075, DeepSeek Flash Latest costs $0.0012. At 1,000 requests/day for a month that is $225 for GPT-5.1-Codex vs $36.18 for DeepSeek Flash Latest.
Estimate your own workload with the per-model calculators (GPT-5.1-Codex, DeepSeek Flash Latest), browse all current prices on the live model pricing dashboard, or run these models head-to-head on a real prompt (free account required). Prices may differ from provider list prices for batch or tiered usage.
Pricing data via the OpenRouter models API.