DeepSeek V3 vs DeepSeek V4 Pro
DeepSeek V3 (DeepSeek, 65,536-token context) versus DeepSeek V4 Pro (DeepSeek, 1,000,000-token context). DeepSeek V4 Pro is cheaper by 5% on a blended token mix. DeepSeek V4 Pro uniquely supports parallel tool calls and structured output (json schema). Across 1 public benchmark we tracked, DeepSeek V3 wins 0 and DeepSeek V4 Pro wins 1. Use the live calculator below to plug your real usage shape into both, then route the winner via Agent Command Center for shadow A/B without code changes.
Bottom line — DeepSeek V3 vs DeepSeek V4 Pro
DeepSeek V3 and DeepSeek V4 Pro are priced within 5% of each other, so cost alone is not the deciding factor. The comparison comes down to capabilities, context window, and benchmark performance on the specific task shape your workload demands.
DeepSeek V4 Pro ships a 1,000,000-token context window, 15.3x larger than DeepSeek V3's 65,536 tokens. That headroom matters for long-document RAG pipelines, multi-turn agent sessions that accumulate tool-call history, and codebases where the entire repository needs to fit in a single prompt. If your average prompt stays under 65,536 tokens, the extra context on DeepSeek V4 Pro is insurance you may never use — and DeepSeek V3 may win on other axes.
On capability surface area, the models diverge: DeepSeek V4 Pro supports parallel tool calls where the other does not; DeepSeek V4 Pro supports structured output (json schema) where the other does not; DeepSeek V4 Pro supports native reasoning mode where the other does not. These differences are binary — either your workload needs the capability or it does not. Check whether any critical path in your agent pipeline depends on a capability only one model provides before committing to a migration.
For teams evaluating both models, the recommended path is a shadow A/B test: route production traffic through an OpenAI-compatible gateway, mirror a percentage to the candidate model, score both responses with an automated evaluator (faithfulness, tool-call correctness, latency), and compare cohort-level metrics over two weeks. Future AGI Agent Command Center supports this pattern with a single `base_url` change and built-in evaluators from the ai-evaluation SDK.
Live workload comparison
Same workload run through both models. The cheaper one is highlighted.
strategy: cost-optimized
primary:
model: deepseek-v3
provider: deepseek
fallback:
model: deepseek-v4-pro
provider: deepseek
shadow: { sample_rate: 0.05 } # mirror 5% of traffic to compare quality live| DeepSeek V3 | DeepSeek V4 Pro | |
|---|---|---|
| Input price | $0.270/M | $0.435/M |
| Output price | $1.10/M | $0.870/M |
| Context window | 65,536 | 1,000,000 |
| Max output | 8,192 | 8,192 |
| Function calling | ✓ | ✓ |
| Vision | — | — |
| Audio input | — | — |
| Reasoning | — | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | — | ✓ |
| Pricing verified | Aug 6, 2026 | Aug 6, 2026 |
Benchmark comparison
Side-by-side public benchmark scores. Greener bar = winner.
Cost at scale: monthly spend at three usage volumes
Estimated monthly cost assuming 1,000 input + 200 output tokens per request — a realistic chat-agent shape. Adjust your own usage in the calculator at the top of this page for an exact number.
| Scale | DeepSeek V3 | DeepSeek V4 Pro | Delta |
|---|---|---|---|
| Startup 10K requests/day | $147 /mo | $183 /mo | $35.70/mo |
| Mid-market 100K requests/day | $1,470 /mo | $1,827 /mo | $357/mo |
| Enterprise 1M requests/day | $14,700 /mo | $18,270 /mo | $3,570/mo |
At enterprise scale (1M requests/day), a difference of even ~10% in unit price compounds into thousands of dollars per month. Cached input pricing and batch tiers can shift this further — both are surfaced on each model's own page.
When to choose which
Picked from the data above — not vendor marketing. Match the rules to your workload, not the other way around.
Your workload needs long context — DeepSeek V4 Pro fits 1,000,000 tokens versus the other model's 65,536, enough headroom for full books, large codebases, or 100+ page documents in one shot.
Your tasks involve multi-step planning or math-heavy reasoning — DeepSeek V4 Pro ships a native reasoning mode that explicitly thinks before responding, the other doesn't.
On arena-elo, DeepSeek V4 Pro scores 99.0 points higher — if your workload pattern matches that benchmark's task shape, the gap is meaningful.
Capability diff — what you gain and lose on the swap
A specific list of what each model has that the other doesn't. If your workload depends on a row in Only DeepSeek V3, switching to DeepSeek V4 Pro means re-architecting that path (and vice versa).
- • Parallel tool calls
- • Structured output (JSON schema)
- • Native reasoning mode
Capabilities both share (3)
- ✓ Function calling
- ✓ Streaming
- ✓ Prompt caching
Benchmark winners — by the numbers
For each public benchmark that has scores for both models, the higher score and the size of the gap. Benchmarks are noisy — treat anything under a 2-point delta as effectively tied.
| Benchmark | DeepSeek V3 | DeepSeek V4 Pro | Winner | Δ |
|---|---|---|---|---|
| arena-elo | 1359.0 | 1458.0 | DeepSeek V4 Pro | +99.0 |
Migration considerations
Concrete differences to wire through your stack before you flip traffic from one to the other.
- Context window changes up 1426% when moving from DeepSeek V3 (65,536) to DeepSeek V4 Pro (1,000,000). Re-check any prompt that relies on cramming long history or documents.
- DeepSeek V4 Pro has capabilities DeepSeek V3 lacks: Parallel tool calls, Structured output (JSON schema), Native reasoning mode. Worth wiring through the agent design before commit.
How to A/B test DeepSeek V3 vs DeepSeek V4 Pro in production
If you're stuck between the two, run them side-by-side on real traffic. Four steps the Future AGI team uses internally:
- 1. Point your existing OpenAI SDK at
https://gateway.futureagi.com/v1. No code change beyondbase_urland a virtual key. - 2. Mark DeepSeek V3 primary, mirror 20% of traffic to DeepSeek V4 Pro in shadow mode. Both responses are logged; only the primary is served to users.
- 3. Score every shadow response with an evaluator — faithfulness, tool-call correctness, response latency, cost. Built-in evaluators in ai-evaluation cover the common axes.
- 4. Compare cohort-level metrics after two weeks. Switch primary when the candidate wins on what matters to your workload — and stays within your latency budget.
Full walkthrough on the Agent Command Center page.
FAQ — DeepSeek V3 vs DeepSeek V4 Pro
Which is cheaper, DeepSeek V3 or DeepSeek V4 Pro? ▾
DeepSeek V4 Pro is cheaper by roughly 5% on a blended input + output token mix. Input prices are $0.270/M for DeepSeek V3 versus $0.435/M for DeepSeek V4 Pro; output prices are $1.10/M versus $0.870/M. The exact savings depend on your input:output ratio — use the live calculator above to plug in your own request shape.
What is the context window of DeepSeek V3 versus DeepSeek V4 Pro? ▾
DeepSeek V3 supports up to 65,536 tokens of context. DeepSeek V4 Pro supports up to 1,000,000 tokens. DeepSeek V4 Pro has the larger window by a factor of 15.3x, which matters for long-document RAG, multi-turn agent sessions, and tasks that need to keep an entire codebase in working memory.
Do DeepSeek V3 and DeepSeek V4 Pro both support tool calling? ▾
Yes — both DeepSeek V3 and DeepSeek V4 Pro support native function calling. Both also support structured output via JSON schema, so an agent can be ported between them with the same tool definitions.
Which model supports prompt caching for cost reduction? ▾
Both DeepSeek V3 and DeepSeek V4 Pro support prompt caching. Cached input tokens are typically discounted 50–90% versus uncached input, depending on the provider. For agents with a stable system prompt + retrieval context, the cached pricing tier is the real unit economics number to track.
When should I choose DeepSeek V3 over DeepSeek V4 Pro? ▾
On the data this page surfaces, DeepSeek V3 is the right pick when DeepSeek V4 Pro's lower price or different capability profile aren't a fit for your workload. Run the live calculator above against your actual usage shape to confirm.
When should I choose DeepSeek V4 Pro over DeepSeek V3? ▾
Your workload needs long context — DeepSeek V4 Pro fits 1,000,000 tokens versus the other model's 65,536, enough headroom for full books, large codebases, or 100+ page documents in one shot. Your tasks involve multi-step planning or math-heavy reasoning — DeepSeek V4 Pro ships a native reasoning mode that explicitly thinks before responding, the other doesn't. On arena-elo, DeepSeek V4 Pro scores 99.0 points higher — if your workload pattern matches that benchmark's task shape, the gap is meaningful.
How do I A/B test DeepSeek V3 against DeepSeek V4 Pro in production? ▾
Route both through an OpenAI-compatible gateway like Future AGI Agent Command Center with shadow mode enabled. Send 100% of traffic to your primary model, mirror 10–20% to the candidate, score every response with an evaluator (faithfulness, tool-call correctness, response time), and compare cohort-level metrics for two weeks. Switch when the candidate wins on the metrics that matter to your workload and stays within your latency budget.