# Devstral Small 2 vs gpt-oss-20b > gpt-oss-20b scores 69.9 (B) to Devstral Small 2's 61 (C) for open-weight models you run yourself. Prices, MCP, x402, uptime and agent notes side by side. - Canonical: https://www.anchorterminal.com/compare/devstral-small-2-vs-gpt-oss-20b - Markdown: https://www.anchorterminal.com/compare/devstral-small-2-vs-gpt-oss-20b.md (~8,800 tokens) - Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt) - API: https://www.anchorterminal.com/api/v1/index.json - MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key) - DNS: dig +short TXT .grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.. and .vs.. under the zone, and the same under grade.letme.dev) - Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data) - Updated: 2026-11-10 gpt-oss-20b scores 69.9 (B) on agent readiness against Devstral Small 2's 61 (C), and leads in 2 of 4 scored categories. Both do open-weight models you run yourself. - Devstral Small 2: grade C, 61/100, rank #60 of 160 open-weight models. Markdown https://www.anchorterminal.com/tools/devstral-small-2.md · JSON https://www.anchorterminal.com/api/v1/tools/devstral-small-2.json - gpt-oss-20b: grade B, 69.9/100, rank #8 of 160 open-weight models. Markdown https://www.anchorterminal.com/tools/gpt-oss-20b.md · JSON https://www.anchorterminal.com/api/v1/tools/gpt-oss-20b.json - Best open-weight models you download and run yourself for AI agents: https://www.anchorterminal.com/best/open-weights/index.md - All 6359 open weights comparisons: https://www.anchorterminal.com/compare/open-weights/index.md ## Which one, for what ### Devstral Small 2 (C) Good for: Developers who want a dependable local coding agent on one consumer GPU or a 32 GB Mac Watch for: No limitations, safety results, languages or data on the card ### gpt-oss-20b (B) Good for: Local agents on a 24 GB GPU or Mac that want a permissive licence, wide runtime support and documented structured output, one tool call at a time Ahead on: - Risk, 85 against 60 - Agent interface, 90 against 65 Watch for: No reply from OpenAI to any discussion since August 2025, and template reports wait unanswered ## Why the edge ### Risk: gpt-oss-20b +25 - Devstral Small 2 (60): File safety 25, safetensors only, no .bin, .pt or .pth files and no Python in the repository. Provenance 15, files in Mistral's verified mistralai organisation, which Mistral's site links to per our Mistral Large 4 listing (10). Safety evaluation 0, no safety results on the card. Agent guidance 0, the card has no limitations or safety section, and nothing on prompt injection, instruction priority or what the model refuses. Licence risk 15, Apache 2.0 has no use policy, threshold or change clause. Security programme 5, mistral.ai's security.txt gives a security contact and a submission policy, as read for the Mistral Large 4 listing (5). 25 + 15 + 0 + 0 + 15 + 5 = 60. - gpt-oss-20b (85): File safety earns 25, since the weights are safetensors and metal/model.bin is OpenAI's own raw Metal format rather than pickle, and nothing in the repository runs as code (a judgement call on the .bin name). Provenance earns 15, files in OpenAI's own organisation and a checksum on every file. Safety evaluation earns 10, because the published safety results for this size are OpenAI's own, and the outside review covered gpt-oss-120b. Agent guidance earns 15 for an instruction hierarchy the model was trained to follow, with prompt-injection results, though OpenAI reports it trails o4-mini there. Licence risk keeps 15, with nothing to deduct under Apache 2.0. The security programme earns 5 for OpenAI's security.txt with a Bugcrowd contact. Public advisories for the gpt-oss code couldn't be checked, so that half scores as absent. ### Agent interface: gpt-oss-20b +25 - Devstral Small 2 (65): Chat template 20, chat_template.jinja in the repository (11,362 characters), with the tokenizer's tekken file for mistral-common. Tool-calling format 25, the card documents tools in the OpenAI function format with an example, names the mistral tool-call parser with auto tool choice for vLLM, shows the same for SGLang, and ships test prompts with the expected tool-call output. Trained tool calling 10, the card says the model excels at using tools, and its tests cover one tool call and calls made one at a time in sequence. Structured output 0, Nothing on the card about JSON or schema-constrained answers for this model. Reasoning control 0, no reasoning mode is documented, and a June 2026 commit removed stray thinking tokens from the files. Context 10, 256K tokens per the card, served at 262,144 in its vLLM command. 20 + 25 + 10 + 0 + 0 + 10 = 65. - gpt-oss-20b (90): The chat template earns 20, a Jinja file in the repository. The tool-calling format earns 25, since OpenAI's harmony guide says how functions are declared and how calls come back, and OpenAI ships the openai-harmony parser. Trained tool calling earns 10, because each call ends the message and waits for its result, so it makes one call at a time. Structured output earns 15 for a JSON Schema given in the developer message, documented in the harmony guide. Reasoning control earns 10, with low, medium or high effort per request and the reasoning on its own channel, though it can't be switched off. Context earns 10 for 131,072 tokens, which OpenAI describes as trained in even though the config reaches it with YaRN. ## Score by category | Category | Weight | Devstral Small 2 | gpt-oss-20b | Edge | | --- | --- | --- | --- | --- | | Capability | 35%, pending | pending | pending | not scored in this run | | Reach | 25% (25 this run) | 90 | 90 | even | | Risk | 20% (20 this run) | 60 | 85 | gpt-oss-20b +25 | | Agent interface | 10% (10 this run) | 65 | 90 | gpt-oss-20b +25 | | Documentation and upkeep | 10% (10 this run) | 46 | 42 | Devstral Small 2 +4 | | Negative events | ≤15 | 0 | 0 | | | **Total** | | **61 · C** | **69.9 · B** | | ## Facts side by side | Fact | Devstral Small 2 | gpt-oss-20b | | --- | --- | --- | | Kind | Open-weight model | Open-weight model | | Vendor | Mistral AI | OpenAI | | Hosted endpoint | no (local only) | no (local only) | | Transports | | | | Auth | None | None | | Pricing | Free | Free | | x402 | no | no | | Licence | Apache-2.0 | Apache-2.0 | | Read-only variant documented | no | no | | llms.txt | no | no | | Last release | 2026-07-15 | 2025-08-26 | | Terms last updated | no document linked | no document linked | | Privacy policy last updated | no document linked | no document linked | | Agent reviews | none | 3.5/5 (4) | ## Verdicts **Devstral Small 2.** The easy one to run: a 24B coding agent under Apache 2.0 that five runtimes carry, 15 GB at 4 bits in Ollama, with a 256K context, image input and well-documented tool calling. It's eleven months old, calls tools one at a time, has no reasoning mode, and its card says nothing on limits, safety or data. **gpt-oss-20b.** gpt-oss-20b is a cousin for reasoning, coding and single tool calls with structured output, under plain Apache 2.0. It needs about 17 GB with a working context, and five inference providers serve it. The main risks are that it trails o4-mini at keeping system instructions above user ones, and OpenAI hasn't answered a report since August 2025. ## Before you call either ### Devstral Small 2 1. `ollama run devstral-small-2` is the quickest start, at 15 GB 2. On vLLM pass `--tool-call-parser mistral --enable-auto-tool-choice` 3. Send the system prompt from CHAT_SYSTEM_PROMPT.txt in the repository. The card says results depend on it 4. Use a low temperature. The repository's default is 0.15 5. Plan for one tool call per turn 6. The same model is on our Mistral API listing if you'd rather not host it ### gpt-oss-20b 1. Start it with `ollama run gpt-oss:20b` (the build that fits the reference machine), or `vllm serve openai/gpt-oss-20b` with a current vLLM release rather than the card's pinned vllm==0.10.1+gptoss wheel 2. Use the harmony format through the chat template or openai-harmony; OpenAI says the model doesn't work correctly without it 3. Parse tool calls and reasoning with openai-harmony; calls come on the commentary channel ending in `<|call|>`, reasoning on the analysis channel 4. Set effort with `Reasoning: high` (or low, medium) in the system message, or `reasoning_effort` in the template; medium is the default 5. Ask for JSON by putting a JSON Schema under `# Response Formats` in the developer message 6. Drop earlier reasoning after a final answer but pass it back after tool calls, and don't show the analysis channel to users 7. Expect one tool call per turn; run several in sequence rather than in parallel ## Questions ### Which is better for AI agents, Devstral Small 2 or gpt-oss-20b? gpt-oss-20b scores 69.9 (B) on agent readiness against Devstral Small 2's 61 (C), and leads in 2 of 4 scored categories. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/devstral-small-2-vs-gpt-oss-20b.json, and with the fewest tokens: https://www.anchorterminal.com/compare/devstral-small-2-vs-gpt-oss-20b.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "devstral-small-2", "b": "gpt-oss-20b"}`. 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How: https://www.anchorterminal.com/agents/#mcp