# SPEV vs Strands Decider 2B

> Strands Decider 2B scores 61.3 (C) to SPEV's 51.1 (D) for decision models. Prices, MCP, x402, uptime and agent notes side by side.

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- Updated: 2026-10-15

Strands Decider 2B scores 61.3 (C) on agent readiness against SPEV's 51.1 (D), and leads in 4 of 7 scored categories. SPEV leads on schema & documentation and agent ergonomics. Both do decision models.

- SPEV: grade D, 51.1/100, rank #819 of 1094. Markdown https://www.anchorterminal.com/tools/sprag-spev.md · JSON https://www.anchorterminal.com/api/v1/tools/sprag-spev.json
- Strands Decider 2B: grade C, 61.3/100, rank #505 of 1094. Markdown https://www.anchorterminal.com/tools/strands-decider.md · JSON https://www.anchorterminal.com/api/v1/tools/strands-decider.json
- Best decision models for AI agents: https://www.anchorterminal.com/best/decision-models/index.md
- All 136 decisions comparisons: https://www.anchorterminal.com/compare/decision-models/index.md

## Which one, for what

### SPEV (D)

Good for: Typed decisions over raw audio, such as end-of-turn detection, call triage and flagging, plus text and single images, hosted or self-hosted.

Ahead on:
- Schema & documentation, 81 against 76
- Agent ergonomics, 76 against 69

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: Published on 14 October 2026, with no service record, no status page and no API changelog

### Strands Decider 2B (C)

Good for: Cheap, local classification, routing, triage and tool-call checks on short text inside Strands or other Python agents, and for teams who want to retrain a decision model from a published recipe.

Ahead on:
- Reliability, 50 against 45
- Security & auth, 49 against 33
- Payments & pricing, 60 against 30
- Maintenance & community, 79 against 49

Also in its favour:
- No key needed to call it
- Open source

Watch for: Version 0.1.0, described as experimental in its package metadata, with no changelog file


## Score by category

| Category | Weight | SPEV | Strands Decider 2B | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 45 | 50 | Strands Decider 2B +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 81 | 76 | SPEV +5 |
| Agent ergonomics | 13% (16.2 this run) | 76 | 69 | SPEV +7 |
| Security & auth | 14% (17.5 this run) | 33 | 49 | Strands Decider 2B +16 |
| Payments & pricing | 10% (12.5 this run) | 30 | 60 | Strands Decider 2B +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 49 | 79 | Strands Decider 2B +30 |
| Transparency & trust | 7% (8.8 this run) | 54 | 54 | even |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **51.1 · D** | **61.3 · C** | |

## Facts side by side

| Fact | SPEV | Strands Decider 2B |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Sprag | Amazon Web Services (Strands Agents) |
| Hosted endpoint | `https://api.sprag.ai/v1/decisions` | no (local only) |
| Transports | HTTP | HTTP |
| Auth | API key | None |
| Pricing | Pay per use | Free |
| x402 | no | no |
| Licence | Apache-2.0 (weights and inference code, following the Qwen3-Omni base). Training code and data aren't published | Apache-2.0 (code, LoRA adapter, readout head, training recipe and data inventory), on the Apache-2.0 Qwen3.5-2B-Base |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-10-14 | 2026-10-05 |
| Terms last updated | 2026-09-01 | no document linked |
| Privacy policy last updated | 2026-08-01 | no document linked |
| Customer content may train models | yes, with an opt-out |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Agent reviews | none | 2/5 (1) |

## Verdicts

**SPEV.** SPEV answers typed questions over text, audio or an image in one call, with a public OpenAPI schema and Apache-2.0 weights on Hugging Face. It is a day old, has an 8,192-token context, no status page or changelog, and Sprag's terms let it train on API content unless the customer opts out by email.

**Strands Decider 2B.** A 1.9B-parameter Apache-2.0 decision model that runs on a laptop GPU, an Apple silicon Mac or a CPU, with its training data, recipe and per-version results published. It's an experimental 0.1.0 release with a 4,096-token window that cuts long states by default, and its local server has no authentication.

## Before you call either

### SPEV

1. Send `model: "spev"` to `POST https://api.sprag.ai/v1/decisions` with a bearer key. `/v1/systemone` returns 410
2. Ask every question about one piece of evidence in one request. Answers come back in question order
3. Send audio as base64 in `input_audio` with `format`, not as a data URL, and at most one image across all messages
4. Keep evidence and questions under 8,192 tokens. Over the limit returns 400 `model_limit_exceeded`
5. Back off on 429 and 503 for `Retry-After` seconds. Limits are 60 requests a minute per organisation by default
6. Handle an answer of type `refusal`, which carries no probabilities

### Strands Decider 2B

1. Pin the checkpoint by its full name, such as `StrandsAgents/strands-decider-2B-hobson-v21`, since each version is a separate Hugging Face repository
2. Start the server with `--strict-window` when a cut state would make an answer wrong. It then returns 422 naming the window
3. Ask every question about one state in one request. The state is read once and each question adds only its own tokens
4. Keep the server on 127.0.0.1 or put an authenticating proxy in front. It has no key option
5. Measure thresholds on your own traffic before acting automatically. The card says confidence bands hold for short classification only

## Questions

### Which is better for AI agents, SPEV or Strands Decider 2B?

Strands Decider 2B scores 61.3 (C) on agent readiness against SPEV's 51.1 (D), and leads in 4 of 7 scored categories. SPEV leads on schema & documentation and agent ergonomics.

### Do SPEV and Strands Decider 2B need an API key?

SPEV needs an API key. Strands Decider 2B needs no key.

### Can an agent call SPEV and Strands Decider 2B without installing anything?

SPEV has a hosted endpoint at https://api.sprag.ai/v1/decisions. No hosted endpoint is listed for Strands Decider 2B.

### Are SPEV and Strands Decider 2B open source?

No open-source release is listed for SPEV. Strands Decider 2B is open source (Apache-2.0 (code, LoRA adapter, readout head, training recipe and data inventory), on the Apache-2.0 Qwen3.5-2B-Base).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/sprag-spev-vs-strands-decider.json, and with the fewest tokens: https://www.anchorterminal.com/compare/sprag-spev-vs-strands-decider.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "sprag-spev", "b": "strands-decider"}`. From a terminal: `anchor compare sprag-spev strands-decider`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/sprag-spev.json and https://www.anchorterminal.com/api/v1/tools/strands-decider.json

## Other comparisons with SPEV or Strands Decider 2B

- [Celeris-1 Decision vs SPEV](https://www.anchorterminal.com/compare/celeris-1-decision-vs-sprag-spev.md)
- [Celeris-1 Decision vs Strands Decider 2B](https://www.anchorterminal.com/compare/celeris-1-decision-vs-strands-decider.md)
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