InternLM Internvl2.5 78B vs DeepSeek-V4 Pro: Live Promos, Pricing, Hidden Fees & Latency
InternLM Internvl2.5 78B (internlm/internvl2.5-78b) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for InternLM Internvl2.5 78B: Activate ephemeral prefix caching to slash input costs by 90% (down to 0.03/1M) or route via asynchronous Batch API for 50% off standard token rates.
Zero-Config Disk KV Cache ($0.022/1M) & Off-Peak UTC Batch Arbitrage
DeepSeek-V4 Pro (1.6T MoE) automatically caches repeated 64-token prompt prefixes on NVMe storage at $0.022/1M off-peak input tokens (vs $0.66 off-peak base) with zero code changes required, plus off-peak UTC scheduling discounts.
In Etuki October 2026 FinOps telemetry comparing InternLM Internvl2.5 78B (API ID: internlm/internvl2.5-78b) vs DeepSeek-V4 Pro (API ID: deepseek-v4-pro), InternLM Internvl2.5 78B offers lower standard input pricing at $0.3/1M tokens ($0.9/1M output), while DeepSeek-V4 Pro leads in cached prefix economics at $0.022/1M tokens (96.7% discount). DeepSeek-V4 Pro achieves a 40ms faster P90 time-to-first-token latency (155ms vs 195ms).
Gateway-synced rate ($0.3/$0.9 per 1M, flat 64K window). Verify upstream provider cache TTL and regional routing before high-volume batch runs.
Off-Peak: $0.66/$1.98 ($0.022 cache); Weekday UTC Peak (01-04 & 06-10): $1.32/$3.96 ($0.044 cache). Chinese statutory holidays count as all-day Off-Peak.
| Specification / FinOps Dimension | InternLM Internvl2.5 78B | DeepSeek-V4 Pro | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | internlm/internvl2.5-78b | deepseek-v4-pro | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $0.3 / $0.9 | $0.66 / $1.98 | InternLM Internvl2.5 78B |
| Cache Read Price (per 1M) | $0.03/1M (90% Off) | $0.022/1M (96.7% Off) | DeepSeek-V4 Pro |
| Context Window / Max Output | 64K In / 64K Out | 128K In / 128K Out | DeepSeek-V4 Pro |
| P90 First-Token / Edge Latency | 195ms | 155ms | DeepSeek-V4 Pro (-40ms) |
InternLM Internvl2.5 78B (internlm/internvl2.5-78b): OpenRouter gateway-synced model at $0.3/1M input, $0.9/1M output, $0.03/1M cached input (64K context window).
DeepSeek-V4 Pro (0813) 1.6T MoE flagship: Off-Peak $0.66/$1.98 ($0.022/1M KV cache hit, 96.7% off); Weekday UTC Peak (01-04 & 06-10) 2x at $1.32/$3.96 ($0.044 cache).
Real-Time Stack Cost & Hidden-Fee Simulator (MAU / Token / Egress / GMV)
Calibrated with Reddit r/FinOps & r/devops telemetry: Includes Context Caching, Bandwidth Egress, and MoR Tax
🐋Switch from InternLM Internvl2.5 78B to DeepSeek-V4 Pro
DeepSeek-V4 Pro (0813) 1.6T MoE flagship: Off-Peak $0.66/$1.98 ($0.022/1M KV cache hit, 96.7% off); Weekday UTC Peak (01-04 & 06-10) 2x at $1.32/$3.96 ($0.044 cache). Verified P90 latency of 155ms.