Claude Opus 4.6 (Fast) vs DeepSeek V4 Flash: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Claude Opus 4.6 (Fast) (Anthropic) and DeepSeek V4 Flash (DeepSeek). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Apr 30, 2026
Interactive Cost Calculator
Fills in typical token counts for a workload type
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Total API calls per month
Showing costs for 2 models. Cheapest: DeepSeek V4 Flash at $2.80/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestDeepSeek V4 Flash | DeepSeek | $2.80 | $0.000280 | $1.40 | $1.40 | 99.7% | Alerts coming soon |
Claude Opus 4.6 (Fast) | Anthropic | $1,050.00 | $0.105000 | $300.00 | $750.00 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | Claude Opus 4.6 (Fast) | DeepSeek V4 Flash | Cheaper |
|---|---|---|---|
| Input (standard) | $30.00/M | $0.14/M | DeepSeek V4 Flash |
| Output | $150.00/M | $0.28/M | DeepSeek V4 Flash |
Prices last verified: 2026-04-09 – 2026-04-30
Cost Breakdown by Usage Volume
Estimated monthly costs at different request volumes, assuming 1,000 input tokens and 500 output tokens per request. Adjust in the calculator above for your specific use case.
| Volume | Claude Opus 4.6 (Fast)Monthly | DeepSeek V4 FlashMonthly | Claude Opus 4.6 (Fast)Per request | DeepSeek V4 FlashPer request |
|---|---|---|---|---|
| 1K requests/mo | $105.00 | $0.28 | $0.105000 | $0.000280 |
| 10K requests/mo | $1,050.00 | $2.80 | $0.105000 | $0.000280 |
| 100K requests/mo | $10,500.00 | $28.00 | $0.105000 | $0.000280 |
| 1M requests/mo | $105,000.00 | $280.00 | $0.105000 | $0.000280 |
Green values indicate the lower-cost option at each volume tier. Cost per request is calculated at 1,000 input + 500 output tokens using standard (non-batch, non-cached) pricing.
When to Choose Claude Opus 4.6 (Fast)
by Anthropic
- Code generation
- Document summarization
- RAG / Semantic search
Input / 1M tokens
$30.00/M
Output / 1M tokens
$150.00/M
Context window
1,000,000
Tier
premium
When to Choose DeepSeek V4 Flash
by DeepSeek
- General chatbot
Input / 1M tokens
$0.14/M
Output / 1M tokens
$0.28/M
Context window
1,048,576
Tier
budget
Key Differences Beyond Price
Cost is only one factor in choosing an AI model. Context window size, rate limits, supported features, and latency all affect whether a model fits your use case.
| Capability | Claude Opus 4.6 (Fast) | DeepSeek V4 Flash |
|---|---|---|
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Max output tokens | 128,000 tokens | 384,000 tokens |
| Performance tier | Premium | Budget |
| Vision / image input | Yes | No |
| Function calling | Yes | Yes |
| JSON mode | Yes | Yes |
| Prompt caching | No | No |
| Batch API (50% discount) | No | No |
| Extended reasoning | Yes | Yes |
| Fine-tuning | No | No |
Frequently Asked Questions
Is Claude Opus 4.6 (Fast) cheaper than DeepSeek V4 Flash?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), DeepSeek V4 Flash costs $28.00/month versus $10,500.00/month for Claude Opus 4.6 (Fast) — a 100% saving. Your actual savings will vary based on your token profile; output-heavy workloads amplify differences in output pricing.
Which model has a larger context window, Claude Opus 4.6 (Fast) or DeepSeek V4 Flash?
DeepSeek V4 Flash has a larger context window at 1,048,576 tokens, compared to 1,000,000 tokens for Claude Opus 4.6 (Fast). A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do Claude Opus 4.6 (Fast) and DeepSeek V4 Flash support the Batch API?
Neither Claude Opus 4.6 (Fast) nor DeepSeek V4 Flash currently supports a batch API with discounted pricing. For batch-eligible alternatives, consider models from OpenAI, Anthropic, or Google that include batch API support.
Which model offers better prompt caching?
Neither Claude Opus 4.6 (Fast) nor DeepSeek V4 Flash currently supports prompt caching. For prompt-caching capable alternatives, consider Claude models from Anthropic or GPT-4o from OpenAI.
What are the best use cases for Claude Opus 4.6 (Fast) vs DeepSeek V4 Flash?
Claude Opus 4.6 (Fast) is best suited for Code generation, Document summarization, RAG / Semantic search, while DeepSeek V4 Flash is optimized for General chatbot. Choose based on which use case matches your primary workload — and validate with the cost calculator above to confirm the total monthly spend fits your budget.
What is the cost per request for Claude Opus 4.6 (Fast) vs DeepSeek V4 Flash?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Claude Opus 4.6 (Fast) costs $0.105000 per request and DeepSeek V4 Flash costs $0.000280 per request. At 100,000 requests/month, that translates to $10,500.00 and $28.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Claude Opus 4.6 (Fast) vs DeepSeek V4 Flash: Summary
When comparing Claude Opus 4.6 (Fast) and DeepSeek V4 Flash for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. DeepSeek V4 Flash offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $28.00/month, compared to $10,500.00/month for Claude Opus 4.6 (Fast).
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Claude Opus 4.6 (Fast) charges $30.00/M for input tokens and $150.00/M for output tokens. DeepSeek V4 Flash charges $0.14/M input and $0.28/M output. If your workload is output-heavy (more tokens generated than consumed as input), the model with the lower output price compounds cost savings significantly at scale.
Context window capacity differs between the two: DeepSeek V4 Flash supports up to 1,048,576 tokens in a single request, versus 1,000,000 tokens for Claude Opus 4.6 (Fast). A larger context window is essential for document summarization, large codebase analysis, and multi-document retrieval-augmented generation (RAG) applications.
Use the interactive calculator at the top of this page to enter your actual token usage and monthly request volume for a precise cost comparison tailored to your workload. Adjust for batch API discounts and prompt caching to find the most cost-effective option for your specific deployment.
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Relevant Use Cases
See cost recommendations for workloads where Claude Opus 4.6 (Fast) or DeepSeek V4 Flash is recommended.