Last updated: January 2026. The flagship-model pricing landscape has shifted dramatically. Below I dissect the rumored GPT-5.5 ($30/MTok output) and DeepSeek V4 ($0.42/MTok output) figures, contrast them against Claude Sonnet 4.5 and GPT-4.1, and explain how engineering teams are migrating to HolySheep AI to capture the savings without re-platforming their code.
Why this comparison matters now
I run the inference platform for a 12-person agent startup that ingests roughly 180 million output tokens a month across customer-support copilots, document extraction, and code-review bots. Six months ago we routed everything through the official OpenAI and Anthropic endpoints directly; today we route 100% of inference through HolySheep's OpenAI-compatible relay. The reason is not philosophical — it's arithmetic. The rumored top-tier output price of GPT-5.5 ($30 per million tokens) and the rumored DeepSeek V4 output price ($0.42/MTok) compress a 71× cost ratio into a single engineering decision: which model you call, and which relay you call it through.
The rumored 2026 price sheet
Both GPT-5.5 and DeepSeek V4 are pre-release at the time of writing. The figures below are sourced from public roadmap hints, model-card leaks, and the developer Discord channels I monitor. Treat them as directional, not contractual.
| Model | Status | Input $/MTok | Output $/MTok | Notes |
|---|---|---|---|---|
| GPT-5.5 (rumored) | Pre-release, Q2 2026 | 5.00 | 30.00 | Flagship reasoning tier |
| GPT-4.1 (published) | GA | 2.00 | 8.00 | Current OpenAI flagship |
| Claude Sonnet 4.5 (published) | GA | 3.00 | 15.00 | Anthropic mid-tier |
| Gemini 2.5 Flash (published) | GA | 0.30 | 2.50 | Google budget tier |
| DeepSeek V4 (rumored) | Pre-release, Q1 2026 | 0.14 | 0.42 | Open-weight successor |
| DeepSeek V3.2 (published) | GA | 0.14 | 0.42 |
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