GPT OSS 120B

by OpenAI

OpenAI's open-weight 120B model — the same architecture family as the GPT-5 line, runnable across many hosts.

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GPT-OSS 120B is OpenAI's open-weight release, available across nine different hosting routes through the Opper gateway: AWS Bedrock EU, Azure, Berget, Cerebras, Evroc, Fireworks, Groq, Nebius, and Infercom. Pick the host that matches your privacy posture and price point — Cerebras and Groq optimise for latency, Berget and Evroc for EU residency, others for breadth. Strong coding and reasoning scores in its weight class.

Key info

Input
Output
Features
Context window
128K
Max output
8K
Input price
$0.15 /1M
Output price
$0.60 /1M
  • EU residency available
  • US residency available
  • Zero data retention on PAYG
  • No training by default
  • GDPR DPA available

Benchmarks

Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.

Global rank#131 of 518 LLMs
TierStrong
Output speed333 tok/s
First token0.52s
Intelligence Index33.3
Coding Index28.6
Math Index93.4
MMLU-Pro
81%
GPQA Diamond
78%
Humanity's Last Exam
19%
LiveCodeBench
88%
SciCode
39%
AIME 2025
93%
IFBench
69%
Long-context reasoning
51%
Terminal-Bench Hard
23%
τ²-Bench Telecom
66%

Available routes

GPT OSS 120B runs on 9 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.

ProviderRegionZero data retentionTrainingInputOutput
AWS BedrockEUPAYGNo$0.15$0.60
BergetEUPAYGNo$0.35$1.05
CerebrasUSEnterpriseNo$0.35$0.75
EvrocEUPAYGNo$0.22$0.86
FireworksUSEnterpriseNo$0.15$0.60
GroqUSEnterpriseNo$0.15$0.60
InfercomEUPAYGNo$0.24$0.64
NebiusEUEnterpriseNo$0.15$0.60
NovitaUSEnterpriseNo$0.05$0.25

Training posture across routes: No training on prompts by default.

Data handling per route

Each route hosting GPT OSS 120B has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

AWS Bedrock Sweden🇸🇪

Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.

Zero data retention
On by default on Pay-as-you-go.
Training
No training on customer data.
Logging
None
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Berget Sweden🇸🇪

Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.

Zero data retention
On by default on Pay-as-you-go.
Training
No training on customer data.
Logging
None
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Cerebras United States🇺🇸

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
None
Third-party access
Provider may share with subprocessors / partners
GDPR DPA
DPA available
Transfer mechanism
SCCs

Evroc Sweden🇸🇪

Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.

Zero data retention
On by default on Pay-as-you-go.
Training
No training on customer data.
Logging
Abuse monitoring
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Fireworks United States🇺🇸

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
None
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

Groq United States🇺🇸

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring (30-day retention)
Third-party access
Provider may share with subprocessors / partners
GDPR DPA
DPA available
Transfer mechanism
SCCs

Infercom Germany🇩🇪

Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. EU; DPA available.

Zero data retention
On by default on Pay-as-you-go.
Training
No training on customer data.
Logging
None
Third-party access
Provider may share with subprocessors / partners
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Nebius Finland🇫🇮

Zero data retention is available via Opper Enterprise contract. No training on customer data. EU; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
Not applicable — data stays in EU

Novita United States🇺🇸

Zero data retention is available via Opper Enterprise contract. No training on customer data. US; SCCs; DPA available.

Zero data retention
Available via Opper Enterprise contract.
Training
No training on customer data.
Logging
Abuse monitoring
Third-party access
None disclosed
GDPR DPA
DPA available
Transfer mechanism
SCCs

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GPT OSS 120B by OpenAI — pricing, benchmarks, ZDR, EU/US hosting | Opper AI