DeepSeek V4 Flash 0731 vs Pro: New Agent Benchmarks Explained
DeepSeek has replaced the original V4 Flash Preview with DeepSeek V4 Flash 0731, the official Flash release. It keeps the same compact architecture while substantially improving coding-agent and tool-use performance through new post-training.
- V4 Flash 0731 has 284B total parameters and 13B active parameters.
- V4 Pro has 1.6T total parameters and 49B active parameters.
Both support a one-million-token context window, thinking and non-thinking modes, tool calls, JSON output, and OpenAI- and Anthropic-compatible APIs.
This DeepSeek V4 Flash 0731 vs Pro comparison uses DeepSeek's latest official model card and current API pricing rather than invented internal tests.
Token Harbor currently offers a free V4 Flash route:
deepseek-v4-flash:free
Short answer: The comparison has changed. In DeepSeek's latest published agent benchmark table, Flash 0731 beats V4 Pro Preview on every listed task, including Terminal-Bench 2.1, DeepSWE, Toolathlon-Verified, and NL2Repo. That makes Flash the evidence-backed starting point for coding agents as well as the lower-cost option. It does not prove Flash is better than Pro for every reasoning or knowledge workload.
Token Harbor did not reproduce these benchmarks. Performance figures below come from DeepSeek's official model card and should be treated as vendor-reported results.
Version update: Token Harbor now serves DeepSeek V4 Flash 0731 through both the paid
deepseek-v4-flashroute and the freedeepseek-v4-flash:freeroute.
Flash vs Pro specifications and pricing
| DeepSeek V4 Flash | DeepSeek V4 Pro | |
|---|---|---|
| DeepSeek official API version | Flash 0731 | V4 Pro |
| Total parameters | 284B | 1.6T |
| Active parameters per token | 13B | 49B |
| Context window | 1M | 1M |
| Maximum output | 384K | 384K |
| Thinking and non-thinking modes | Yes | Yes |
| Tool calls and JSON output | Yes | Yes |
| Responses API | Yes | Not yet in current docs |
| Cache-hit input / 1M | $0.0028 | $0.003625 |
| Cache-miss input / 1M | $0.14 | $0.435 |
| Output / 1M | $0.28 | $0.87 |
| Token Harbor model ID | deepseek-v4-flash | deepseek-v4-pro |
| Current Token Harbor version | Flash 0731 | V4 Pro |
At current cache-miss input and output rates, Pro costs about 3.1 times as much per token as Flash.
Sources: DeepSeek V4 Flash 0731 model card and DeepSeek API pricing. Prices and features can change, so check the live Token Harbor model catalog before deployment.
Product availability and free-access terms checked August 6, 2026.
Try the free DeepSeek V4 Flash API on Token Harbor
DeepSeek charges for V4 Flash through its official API. Token Harbor currently subsidizes eligible access through:
deepseek-v4-flash:free
The standard paid route remains:
deepseek-v4-flash
Both Token Harbor routes now use Flash 0731. The free route lets eligible users test the current model before committing budget. The first free request starts a personal rolling seven-day period; usage is limited by a value-based allowance rather than a fixed request count. Free-model availability and limits may change, so check the live Token Harbor FAQ.
What changed in DeepSeek V4 Flash 0731?
DeepSeek says Flash 0731 supersedes the preview release while keeping the same model structure. The main change is post-training aimed at stronger agentic performance. The official API retains the stable deepseek-v4-flash model ID and now identifies its version as DeepSeek-V4-Flash-0731.
Flash 0731 also adds native support for the Responses API. Both Flash and Pro continue to support thinking and non-thinking modes, tool calls, JSON output, the Anthropic API, and a one-million-token context window.
Latest official Flash 0731 vs Pro benchmarks
DeepSeek's new comparison focuses on agent and coding-agent tasks. It compares the official Flash 0731 release with both the earlier Flash Preview and V4 Pro Preview:
| Benchmark | Flash 0731 | Flash Preview | Pro Preview | 0731 vs Pro |
|---|---|---|---|---|
| Terminal-Bench 2.1 | 82.7 | 61.8 | 72.1 | +10.6 |
| NL2Repo | 54.2 | 39.4 | 38.5 | +15.7 |
| Cybergym | 76.7 | 38.7 | 52.7 | +24.0 |
| DeepSWE | 54.4 | 7.3 | 12.8 | +41.6 |
| Toolathlon-Verified | 70.3 | 49.7 | 55.9 | +14.4 |
| Agents' Last Exam | 25.2 | 15.8 | 16.5 | +8.7 |
| AutomationBench Public | 25.1 | 10.8 | 12.8 | +12.3 |
Flash 0731 leads Pro Preview on every public benchmark in this table. The largest reported gains are on DeepSWE and Cybergym, while Terminal-Bench 2.1 rises from 61.8 for Flash Preview to 82.7 for 0731.
Source: DeepSeek V4 Flash 0731 official model card.
How to read these results fairly
The new numbers are vendor-reported. For public code-agent tasks, DeepSeek evaluated Flash 0731 with the minimal mode of its unreleased DeepSeek Harness, max reasoning effort, temperature = 1.0, and top_p = 0.95.
The table supports a specific conclusion: Flash 0731 is much stronger than Flash Preview on these agent tasks and outperforms the listed Pro Preview configuration. It does not establish that Flash is universally better for factual knowledge, every programming language, every agent harness, or every repository.
Which model should you use now?
| Start with Flash 0731 when... | Test Pro when... |
|---|---|
| You are building a coding or terminal agent | Flash fails your repository's acceptance tests |
| You want the latest evidence-backed agent performance | Your workload is not represented by the new benchmarks |
| Token cost or high-volume usage matters | You already have evidence that Pro performs better on your tasks |
| You want Responses API support | You need a controlled comparison before changing production |
The evidence-backed default is now to test Flash first, including for multi-step agent work. Pro remains a valid comparison candidate, but the latest public vendor table no longer supports recommending it automatically for terminal and tool-use tasks.
Free-route privacy note
Token Harbor distinguishes paid and free routes. Paid routes are zero-data-retention. Free routes may retain prompts and responses after users explicitly opt in; they are disabled by default.
Do not send credentials, customer information, unreleased code, or private repositories through a free route unless the current policy meets your requirements. Use an appropriate paid route for privacy-sensitive workloads.
See the latest Token Harbor FAQ.
API example
Token Harbor uses an OpenAI-compatible API:
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.TOKEN_HARBOR_API_KEY,
baseURL: "https://tokenharbor.ai/v1",
});
const response = await client.chat.completions.create({
model: "deepseek-v4-flash:free",
messages: [
{
role: "user",
content: "Write unit tests for this function and explain the edge cases.",
},
],
});
console.log(response.choices[0].message.content);
Switch models by changing the ID:
// Free Flash
model: "deepseek-v4-flash:free"
// Paid Flash
model: "deepseek-v4-flash"
// Paid Pro
model: "deepseek-v4-pro"
Confirm current IDs in the model catalog.
FAQ
Is DeepSeek V4 Flash free?
DeepSeek charges for V4 Flash through its official API. Token Harbor currently offers eligible access through deepseek-v4-flash:free, subject to current limits and policies.
Does Token Harbor's free route use DeepSeek V4 Flash 0731?
Yes. Token Harbor now serves Flash 0731 through both deepseek-v4-flash:free and the paid deepseek-v4-flash route.
Is Flash as good as Pro for coding?
In DeepSeek's latest official agent table, Flash 0731 beats V4 Pro Preview on every listed public task, including Terminal-Bench 2.1 and DeepSWE. That is strong evidence for agentic coding, but it does not establish a universal lead across all coding and reasoning workloads.
Is Pro worth the higher price?
The latest vendor results no longer make Pro the automatic choice for terminal agents or multi-step tool use. Test Pro when your workload is not represented by the new benchmark set or when your own acceptance tests show that it performs better.
Do both models support tool calls and one million tokens of context?
Yes. DeepSeek's current API documentation lists tool calls, JSON output, and a one-million-token context window for both.
The bottom line
DeepSeek V4 Flash 0731 is a major agentic upgrade over Flash Preview. In DeepSeek's latest table, it also outperforms V4 Pro Preview across every listed public agent benchmark while retaining Flash's lower token price.
Token Harbor now provides the 0731 release through both its paid and free Flash routes. The free route offers a practical way to evaluate the model on your own coding-agent workload before paying for production usage.
Try DeepSeek V4 Flash free · Browse models · Review the free-access policy