API cost decision in 10 seconds

NewUnion Alpha vs Seed-2.0-Code

Pick Union Alpha when budget is the priority.

Page updated: 2026-09-16T15:08:45Z Data confirmed: 2026-09-16T16:08:25Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Union Alpha when budget is the priority.

On the standard 1M input plus 500K output workload, Union Alpha is estimated at $0 vs $2 for Seed-2.0-Code, saving $2 (100% lower).

Cost-first pickUnion Alpha

Context-first pickBoth models

Sample savings$2100%

10x traffic gap$20

The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $20. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Union Alpha stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shape	Token mix	Better pick	Union Alpha	Seed-2.0-Code
Input-heavy / RAG	5M input + 500K output	Union Alpha	$0	$4
Balanced workload	1M input + 1M output	Union Alpha	$0	$3.5
Output-heavy chatbot	1M input + 5M output	Union Alpha	$0	$15.5

Cheaper input Union Alpha $0 vs $0.5 / 1M

Union Alpha is free for input tokens while Seed-2.0-Code costs $0.5 per 1M tokens.

Cheaper output Union Alpha $0 vs $3 / 1M

Union Alpha is free for output tokens while Seed-2.0-Code costs $3 per 1M tokens.

Larger context Tie 262.14K vs 262.14K

Both models report the same context window at 262.14K tokens.

Sample workload Union Alpha $0 vs $2

Union Alpha is free for the standard workload while the other model is estimated at $2.

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Union Alpha Calculating… Estimated API cost

Seed-2.0-Code Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

Union Alpha has the lower input price; Union Alpha has the lower output price; both models report the same context window. For the 1M input plus 500K output sample, Union Alpha is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0 for Union Alpha and $2 for Seed-2.0-Code.

Best Fit

Choose Union Alpha when you care most about lower input-token price, and lower output-token price.

Choose Seed-2.0-Code when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Decision Notes

On the standard 1M input plus 500K output workload, Union Alpha is estimated at $0 vs $2 for Seed-2.0-Code, saving $2 (100% lower).
Union Alpha is free for the standard workload while the other model is estimated at $2.
Union Alpha is free for input tokens while Seed-2.0-Code costs $0.5 per 1M tokens.
Union Alpha is free for output tokens while Seed-2.0-Code costs $3 per 1M tokens.
Both models report the same context window at 262.14K tokens.

Head-to-Head Specs

Feature	NewUnion Alpha (stealth)	Seed-2.0-Code (ByteDance Seed)
Input Price prompt tokens per 1M	$0	$0.5
Completion Price per 1M tokens	$0	$3
Sample Workload Cost 1M input + 500K output	$0	$2
Context Window	262.14K	262.14K
Release Date	2026-09-16	2026-08-12

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Union Alpha	On the standard 1M input plus 500K output workload, Union Alpha is estimated at $0 vs $2 for Seed-2.0-Code, saving $2 (100% lower).
High-volume input processing	Union Alpha	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Union Alpha	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Tie	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Seed 1.6 Flash can replace Seed-2.0-Code when lower sample workload cost matters most: $0.22.
Seed-2.0-Mini can replace Seed-2.0-Code when lower sample workload cost matters most: $0.3.
Seed-2.0-Lite can replace Seed-2.0-Code when lower sample workload cost matters most: $1.25.
Seed 1.6 can replace Seed-2.0-Code when lower sample workload cost matters most: $1.25.

Larger context near this budget

Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
DeepSeek V4 Flash 0731 offers 1.31M context with $0.12 sample workload cost.
GLM 5.3 Flash offers 1.31M context with $0.24 sample workload cost.

Popular competitors

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GPT-5.6 Luna · OpenAI · #2
Hy4 preview · Tencent · #3
DeepSeek V4 Flash 0731 · DeepSeek · #4

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

stealth catalog

Review all tracked stealth models before deciding whether this matchup is the right shortlist.

Open stealth models

ByteDance Seed catalog

Check other ByteDance Seed models with comparable pricing, context, or release timing.

Open ByteDance Seed models

Union Alpha

Union Alpha is a multimodal model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks. Union Alpha is a stealth model....

Seed-2.0-Code

Seed 2.0 Code is a model from ByteDance Seed optimized for agentic coding. It is suited for frontend development, multilingual programming tasks, and coding-agent workflows in tools such as Claude...