Grok 4.3 vs DeepSeek V4-Pro: Price-Performance (May 2026)
Grok 4.3 vs DeepSeek V4-Pro: Price-Performance (May 2026)
Two challenger models squeezing the frontier on price. Grok 4.3 is closed and cheap. DeepSeek V4-Pro is open-weights and cheaper still with caching. Here’s how to choose in May 2026.
Last verified: May 11, 2026
At a glance
| Property | Grok 4.3 | DeepSeek V4-Pro |
|---|---|---|
| Released | April 30, 2026 (full API rollout) | April 24, 2026 (preview); full launch May 2026 |
| Context window | 1M tokens | 1M tokens |
| Input price (per 1M) | $1.25 | $1.74 (cache miss $0.435) |
| Output price (per 1M) | $2.50 | $3.48 (promo: $0.87) |
| Cached input | — | $0.003625 per 1M |
| Open weights | No | Yes (MIT license) |
| Self-hostable | No | Yes |
| Native video input | Yes | No |
| Real-time data | Yes (X) | No |
| Knowledge cutoff | December 2025 | (latest pre-train) |
| Tool-calling accuracy | Strong | Improved (hybrid reasoning) |
Pricing: who really wins?
Naive comparison (list, no caching):
- Grok 4.3: $1.25 / $2.50 per 1M input/output → cheaper at full list
- DeepSeek V4-Pro: $1.74 / $3.48 per 1M
With DeepSeek caching enabled:
- Cache-miss input: $0.435 per 1M (already below Grok 4.3 list)
- Cache-hit input: $0.003625 per 1M (≈350x cheaper than Grok 4.3 input)
- Promo output through May 5, 2026: $0.87 per 1M (below Grok 4.3 output)
The verdict. If your application reuses system prompts heavily (chat assistants, codebase Q&A, RAG with persistent context), DeepSeek V4-Pro is dramatically cheaper because the cached input pricing dominates the bill. If your application is mostly uncached output-heavy agent loops (autonomous coding, multi-step browsing), Grok 4.3 list prices are cheaper.
For most production workloads with caching turned on, DeepSeek V4-Pro ends up cheaper per task for chat/assistant use cases. For pure agentic generation, Grok 4.3 has the edge.
Context window: 1M tokens, both
Both ship a 1M-token default context. The question is performance held at long context.
- Grok 4.3: Oracle’s docs and xAI’s release materials emphasize multi-step investigation across the full window.
- DeepSeek V4-Pro: Architectural improvements in V4 include longer context windows with improved tool calling accuracy.
Independent benchmarks (May 2026) consistently put GPT-5.5 and Grok 4.3 at the top for long-context retention. DeepSeek V4-Pro is competitive but not yet the top performer past 128K tokens.
Open weights vs API-only
This is the biggest strategic difference.
DeepSeek V4-Pro is open weights under the MIT license. You can:
- Download the model.
- Self-host on your own GPUs.
- Run on Huawei Ascend, NVIDIA H200, AMD MI300X, or any compatible accelerator.
- Fine-tune on proprietary data.
- Deploy on-prem for regulated workloads.
- Use any inference provider (Together, Fireworks, Cerebras, etc.).
Grok 4.3 is closed weights, API-only via xAI or Oracle Cloud Infrastructure (OCI). No self-hosting, no fine-tuning, no on-prem option.
For regulated industries (healthcare, finance, defense), or enterprises that want weight ownership and a multi-provider runtime story, DeepSeek V4-Pro is the only choice between these two.
Unique capabilities
Grok 4.3:
- Real-time X (Twitter) data access — useful for news monitoring, social listening, current-events agents.
- Native video input — first major model to ship video-in at this scale.
- 1M context with no output token limit — useful for long-form generation.
DeepSeek V4-Pro:
- Hybrid reasoning modes — switch between fast and deep reasoning per request.
- Improved tool-calling accuracy — important for production agents.
- Strongest open-weights model lineup in May 2026.
Agent-loop economics
For high-volume agent pipelines (10M+ tokens/day):
| Scenario | Best pick |
|---|---|
| Chat assistant with cached system prompt | DeepSeek V4-Pro (cache crushes the bill) |
| Autonomous coding agent (cold-cache, output-heavy) | Grok 4.3 (list price wins) |
| Long-context codebase audit | Either (1M context, both work) |
| Self-hosted on-prem | DeepSeek V4-Pro (only option) |
| Real-time current events agent | Grok 4.3 (X data access) |
| Video understanding | Grok 4.3 (native video input) |
| Multi-provider redundancy | DeepSeek V4-Pro (any inference provider) |
| Fine-tune on proprietary data | DeepSeek V4-Pro (open weights) |
Decision tree
Pick Grok 4.3 when:
- You need real-time X data or native video.
- Workload is uncached output-heavy generation.
- You’re OK with closed weights and API-only.
- You want xAI / OCI as your provider.
Pick DeepSeek V4-Pro when:
- Cache hit rate is high (assistants, RAG, persistent system prompts).
- Self-hosting, on-prem, or fine-tuning matters.
- You want multi-provider flexibility (Together, Fireworks, your own GPUs).
- Total cost of ownership beats list-price comparison.
What to watch next
- DeepSeek V4 full launch following the April 24 preview.
- Grok 5 rumors for later 2026.
- Pricing wars — both vendors cut prices in late April; expect more in coming months.
- Long-context benchmarks — independent evaluations on retrieval and reasoning past 256K tokens.
Related reading
- Grok 4.3 vs Claude Opus 4.7 vs GPT-5.5 coding
- DeepSeek V4-Pro vs DeepSeek V4-Flash
- DeepSeek V4-Pro vs GPT-5.5 pricing
- DeepSeek V4 self-hosted vs API
Last verified: May 11, 2026 — sources: xAI Grok 4.3 docs, Oracle Cloud Grok 4.3 docs, DeepSeek V4 pricing page, Verdent.ai migration guide, MindStudio pricing analysis, TheNextWeb, Qz pricing coverage.