Doubao Seed Evolving vs GLM-5.3-Flash
Doubao Seed Evolving wins on Overall, Coding, Multimodal. Every numeric field is compared below, with a worked monthly-cost example and a pick rule for each use case.
Verdict at a glance
Choose Doubao Seed Evolving if you…
- Continuously updated
- 1M context
- Good Chinese
- ByteDance ecosystem
- Best for: Chinese, Long context, Continuously evolving
Choose GLM-5.3-Flash if you…
- Among the cheapest
- Fast
- Open source
- Best for: Ultra-fast, Ultra-low-cost, High concurrency
Head-to-head aggregate scores
Scores are 0–100, aggregated from public benchmark information and independently weighted across three leaderboards. Rank is out of 22 tracked models.
Aggregated from public sources and independently weighted; methodology on the Terms page. Scores within 3 points are treated as statistically tied.
Specs & pricing — every field side by side
List API prices in USD per 1M tokens. The highlighted cell is the stronger value/capability on that row.
| Dimension | Doubao Seed Evolving | GLM-5.3-Flash | Verdict |
|---|---|---|---|
| Vendor | ByteDance (CN) | Zhipu AI (CN) | Different vendors |
| Released | 2026.07 | 2026.08 | GLM-5.3-Flash is newer |
| Overall (rank) | 68 · #15 | 65 · #18 | Doubao Seed Evolving +3 |
| Coding | 67 · #14 | 60 · #20 | Doubao Seed Evolving +7 |
| Multimodal | 83 · #9 | 63 · #21 | Doubao Seed Evolving +20 |
| Context window | 1M | 128K | Doubao Seed Evolving larger |
| Max output | 256K | 64K | GLM-5.3-Flash longer |
| Effective-context | 92 | 80 | Doubao Seed Evolving more reliable |
| Input $/1M | $0.83 | $0.07 | GLM-5.3-Flash cheaper |
| Output $/1M | $4.17 | $0.25 | GLM-5.3-Flash cheaper |
| Cache discount | custom | none | GLM-5.3-Flash deeper |
| Speed | ~60 tok/s | ~90 tok/s | GLM-5.3-Flash faster |
| TTFT | 0.5s | 0.2s | GLM-5.3-Flash snappier |
| Function calling | 82 | 70 | Doubao Seed Evolving ahead |
| Refusal rate | ~10% | ~6% | GLM-5.3-Flash less restrictive |
| English | 70 | 65 | Doubao Seed Evolving |
| Chinese | 93 | 85 | Doubao Seed Evolving |
| Modalities | text, image | text | different coverage |
| Open weights | No | Yes | GLM-5.3-Flash is open |
| Fine-tuning | No | Yes | |
| Free tier | Doubao App free | ChatGLM free | |
| SOC2 / no-train | no / yes | no / yes | |
| Private deployment | Yes | Yes | Both support it |
Fields drawn from vendor public documentation and the Modelspectra 22-model dataset; speed varies with network, concurrency and prompt length. Verify current pricing before purchase.
Dimension-by-dimension analysis
Reasoning & overall intelligence
Doubao Seed Evolving leads the overall aggregate by 3 points (68 vs 65). That is a meaningful, not marginal, edge on hard, multi-step reasoning, while GLM-5.3-Flash remains a strong generalist that is not out of its depth on routine work.
Agentic coding
This is a modest gap: Doubao Seed Evolving scores 67 against 60. On multi-file edits, SWE-style tickets and long-horizon agent loops Doubao Seed Evolving needs fewer correction turns; GLM-5.3-Flash is still competent for scripts and assisted completion but trails as task complexity rises.
Multimodal
Doubao Seed Evolving leads multimodal 83 vs 63. A concrete modality difference: Doubao Seed Evolving additionally handles image. Neither emits native video, so the comparison is about parsing images and documents, not generation.
Speed & latency
GLM-5.3-Flash is faster in interactive use: ~90 tok/s with 0.2s TTFT versus ~60 tok/s with 0.5s TTFT (about 1.5× the throughput). For conversational UIs where perceived responsiveness drives retention, that edge is a real product factor even when raw reasoning is lower.
Context: window vs usable recall
Nominal windows are 1M for Doubao Seed Evolving and 128K for GLM-5.3-Flash. Effective-context scores point the same way as window size — Doubao Seed Evolving is ahead on usable recall (92 vs 80), so prefer it for long-document work where details cannot be missed.
Price & total cost
GLM-5.3-Flash is the cheaper API at $0.07/$0.25 versus Doubao Seed Evolving at $0.83/$4.17 per 1M input/output tokens — list input is about 11.1× lower.
Chinese vs English
English: Doubao Seed Evolving 70 vs GLM-5.3-Flash 65. Chinese: 93 vs 85. For Chinese-language production, Doubao Seed Evolving is the stronger pick. Note that non-Chinese models generally require overseas network access for their APIs.
Tool use & ecosystem
Function-calling score: Doubao Seed Evolving 82 vs GLM-5.3-Flash 70, so Doubao Seed Evolving has the edge on structured tool use. Fine-tuning is available from GLM-5.3-Flash. Factor in existing SDK/plugin familiarity — switching cost often outweighs a few-point tool-use gap.
Cost worked example — same workload, real token math
Assume a production workload of 100M input + 30M output tokens per month, with 90% of input tokens served from cache. Figures use public list prices.
| Scenario · per month | Doubao Seed Evolving | GLM-5.3-Flash | Gap |
|---|---|---|---|
| List priceno cache applied | $208100M in × $0.83 + 30M out × $4.17 | $15100M in × $0.07 + 30M out × $0.25 | 13.87×gap |
| With caching90% of inputs cache-hit | $208no published cache discount | $15no published cache discount | 13.87×gap |
Illustrative model; your input/output mix and cache-hit ratio change the result. Prices are list rates before any enterprise agreement.