The price of DeepSeek V4 Pro is permanently reduced to 1/4: the model pricing war ends, and developers’ AI costs enter a new stage

Core conclusion

DeepSeek officially announced on May 25 that V4 Pro API pricing will be permanently reduced to 1/4 of the original price after a 75% discount promotion (ends on 2026/05/31). This means that the actual cost of V4 Pro is fixed at $0.28/Mtok (input) and $1.12/Mtok (output) - compared to Anthropic Claude Opus 4 ($15/Mtok) and GPT-4.5 ($15/Mtok), the cost gap widens to 10-50 times.

At the same time, the open source community released DeepSeek Reasonix - a native programming agent designed specifically for the DeepSeek caching mechanism. Achieve 94% cache hit rate with append-only run loop, further compressing the effective cost to $0.014/Mtok.

Background: The End of the 75% Off Sale

DeepSeek launched a 75% discount promotion on V4 Pro in early May 2026, driving down the price significantly to attract developers to try it out. While on sale, V4 Pro's inference quality is on par with Claude Opus 4 and GPT-4.5, but at 1/50 the cost.

However, there are always doubts in the market about "whether the promotional prices will continue." Many developers regard this as a "trial period" and are afraid to completely migrate the production environment.

The announcement on May 25th completely removes this uncertainty:

"The deepseek-v4-pro model API pricing will be officially adjusted to 1/4 of the original price after the 75% discount promotion ends on 2026/05/31 15:59 UTC." — DeepSeek official X account

Permanent pricing base (after reduction to 1/4):

Key Impact

Industry impact: AI programming costs enter the "free era

V4 Pro’s permanent price reduction coupled with Reasonix’s caching optimization, the actual cost of AI programming is approaching the critical point of “almost free”:

• Traditional Claude Code Cost: Approximately $200-500 monthly active usage (Opus 4 outputs $75/Mtok)
• Replacement with DeepSeek V4 Pro + Reasonix: Same workload about $5-15/ months (after hitting cache $0.014/Mtok)
• Actual decrease: 90-97%

Note: DeepSeek does not provide inference monitoring and output quality verification, and is not suitable for scenarios that require strict auditing such as medical care and finance.

The core point of the heated discussion on HN: "China is taking price performance seriously, and the US model vendors are looking for performance at any cost. Companies focused on price performance will end up with more economic resources."

For content entrepreneurs and independent developers, this means:

1. The monthly cost of AI programming tools has dropped from "the cost of a meal" to "the cost of a cup of coffee"
2. Not tied to a single platform: DeepSeek’s open ecosystem means you can switch at any time without worrying about vendor lock-in
3. The cost structure of automated pipelines has completely changed: The cost of automated content pipelines with high-frequency API calls can be reduced to almost zero.

Reasonix: Programming Agent for Caching

Reasonix is the most noteworthy ecological partner in this price reduction wave. It is a terminal programming Agent that directly connects to api.deepseek.com. The core design revolves around DeepSeek's prefix-cache mechanism:

Key Design:

• Append-only loop: No rearrangement, no compression of history, ensuring cache prefix is stable after each tool call
• 94% cache hit rate: maintained continuously in long sessions, input token cost reduced to 1/5
• MCP First Class Citizen: Supports three transmissions: stdio/SSE/Streamable HTTP
• Skill Orchestration: .reasonix/skills/<name>.md, supports subagent isolated operation
• Dual gear engine: Flash is used by default, and the /pro command switches to V4 Pro as needed.

Installation using: npx reasonix code (no need to install globally, Node ≥ 22)

Adaptation suggestions

1. Recalculation of cost model: Migrate the budget of the main AI model from Claude/GPT to DeepSeek V4 Pro, and the monthly fee can be reduced by 10-50 times
2. Adopt cache-friendly architecture: Use append-only mode in Agent workflow to avoid reordering/timestamp filling from destroying cache prefixes
3. Preserving quality gate: DeepSeek’s inference quality is comparable to Opus 4, but the output stability still needs to be verified. Add verification links to the production pipeline
4. Pricing window utilization: The 75% discount window before May 31 is still valid, suitable for large-scale migration testing

Tool entry (automatically trigger floating card)

The following tools naturally appear in the text, and the platform side will automatically match the maintained tools library and display the hover-card: DeepSeek, OpenAI, ChatGPT, Claude, Gemini, Claude Code, n8n

Reference sources

• HN: DeepSeek makes the V4 Pro price discount permanent
• DeepSeek Reasonix
• GitHub: esengine/DeepSeek-Reasonix

Internal link guidance

• Want to learn how to use DeepSeek instead of Claude Code to save money? Watch: DeepSeek V4 vs Claude Code: 90% Cheaper, Same Quality
• Use Reasonix to build a complete AI programming workflow: DeepSeek Reasonix in action: Build an AI programming agent at zero cost (30-minute tutorial)
• Real case: He used n8n + OpenClaw to build automated workflow: Indie Developer: n8n + OpenClaw Automation Workflow Earning $5,000/mo