Key points
- Same-night launches on August 12, 2026: DeepSeek V4 Pro 0813 and SpaceXAI's Grok 4.6 went live within two hours of each other, marking the closing segment of August's AI coding backend upgrade curve.
- DeepSeek V4 Pro 0813: same 1.6T MoE / 49B active parameters and 1M context as the April preview. The release is purely post-training (GA stabilization + multi-turn agent RL). Benchmarks jumped sharply: DeepSWE 12.8 → 62.7, Terminal Bench 2.1 72.1 → 87.9, Cybergym 52.7 → 83.3. Pricing remains at $0.435 / $0.87 per million tokens (input/output) — roughly 1/60 of Claude Fable 5 Max.
- Grok 4.6: built on the same 1.5T V9 base used since July, with experts expanded 128 → 256 while keeping 8–16 active per token (more "selectable capability," not higher per-inference cost). Scores 61 on AA Intelligence Index (vs. Fable 5 Max 62, GPT-5.6 Sol 61). DeepSWE v1.1: 65.9%. Pricing: $2 / $6 per million tokens.
- API ecosystem reach: DeepSeek exposes OpenAI, Anthropic, and Responses API formats, plus Chat and Huawei Ascend support — meaning any LiteLLM or routing layer silently upgrades to V4 Pro 0813. Grok 4.6 is integrated with Cursor (2× first-week usage), Grok Build, OpenRouter, Vercel, and Cloudflare.
- Long-horizon agent efficiency: Singularity.Kwi's AA-Briefcase comparison shows Grok 4.6 completes the same task in ~53 turns and ~0.5B input tokens vs. Claude Opus 5 (max) at ~103 turns and ~2B tokens — half the turns, one-quarter the tokens.
- DeepSWE as the new battleground: full-codebase multi-file editing benchmark replacing HumanEval/MBPP. Top scores: GPT-5.6 Sol 73%, Fable 5 Max 70%, Grok 4.6 65.9%, DeepSeek V4 Pro 0813 62.7%.
- Grok 4.6 pricing caveat: above 200K prompt tokens, input jumps to $4 and output to $12 per million — applied to the entire request, which can hurt accumulating-context agents.
- DeepSeek V4 Pro 0813 has no vision/audio/video — multimodal "full" version still undated as of August 13
- Grok 4.6 200K+ long-context pricing jump real-world impact needs more deployment data
- DeepSeek pricing is pre-increase — future hike magnitude and zero-cost switch window length undisclosed
- Neither model has published independent third-party API latency / throughput data
- Grok 4.6 quality above 200K context lacks public benchmarks
- https://api-docs.deepseek.com/quickstart/pricing
- https://weibo.com/5424490006/5331252565247196
- https://k.sina.com.cn/article_7879923925_1d5ae18d506801mg5e.html
- https://www.cnblogs.com/sing1ee/p/22436555
- https://k.sina.com.cn/article_7879996424_1d5af340806801n246.html
- http://x.ai/news/grok-4-6
- https://tech.ifeng.com/c/8vX3XV7yIcU
- https://singularity.kiwi/spacexai-grok-4-6-frontier-cheap-agents-2026
- http://agentbreaking.com/blog/grok-4-6-deep-dive-benchmarks
Comparison table
| Dimension | DeepSeek V4 Pro 0813 | Grok 4.6 | Claude Fable 5 Max | |---|---|---|---| | Total / active params | 1.6T MoE / 49B | 1.5T MoE / 8–16 active | undisclosed | | Context / max output | 1M / 384K | 256K (stable 128K) / 500K (if benchmark supports) | 200K | | AA Intelligence Index | — | 61 | 62 | | DeepSWE v1.1 | — | 65.9% | 70% | | Terminal-Bench v3.0 | — | 26% | 34.1% | | DeepSWE (preview → GA) | 12.8 → 62.7 | — | — | | Terminal Bench 2.1 (preview → GA) | 72.1 → 87.9 | — | — | | Cybergym (preview → GA) | 52.7 → 83.3 | — | — | | Price ($/MTok in / out) | 0.435 / 0.87 | 2 / 6 | 5 / 25 | | Platforms | API (OpenAI + Anthropic + Responses) / Chat / Huawei Ascend | Cursor / Grok Build / OpenRouter / Vercel / Cloudflare | Anthropic API / Bedrock / Vertex |
Product strategy
Both launches sit at the "mid-price + long-horizon agent" tier. Cursor's 2× first-week usage for Grok 4.6 and DeepSeek's free pre-price-hike migration window mean developers no longer face a binary choice between "cheap DeepSeek" and "integrated Grok ecosystem."
Ranking by dimension: 1. Price-performance: DeepSeek V4 Pro 0813 wins (60× gap) 2. Multimodality: Grok 4.6 wins (text + image + audio + video + Grok Build) 3. Default agent harness coverage: DeepSeek wins (API protocol-level reach) 4. Long-horizon reasoning efficiency: Grok 4.6 wins (half the turns, 1/4 the tokens) 5. Long-context cost: Grok 4.6 may lose (200K+ automatic price jump)
Limitations and unknowns
Why same-night timing matters
The dual launch gives developers a unified "mid-price, long-context, strong-agent, cross-harness" option that didn't exist at the start of August. Domestic developers get a fully self-hostable Ascend path without NVIDIA dependency; international developers get a Cursor/Cloudflare/Vercel/OpenRouter-defaulted model with full agent chain capability at half the cost of Opus 5 or Fable 5 Max. August 12 effectively splits AI coding backends from "expensive but strong" into two independent tracks: "expensive but strong" and "cheap but strong."