GPT-5.6 (Sol / Terra / Luna) is now evaluated on TrustVector — with day-1 independent verification, incl. METR's benchmark-cheating findings.

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Evaluation record · openai-assistants-api

OpenAI Assistants API

vv2

OpenAI

Agentopenaiassistantsdeprecated
85
Strong
About This Agent

DEPRECATED: the Assistants API will be sunset on 2026-08-26 (under 7 weeks away); after that date all /v1/assistants, /v1/threads, and /v1/threads/runs calls return errors. OpenAI directs users to the Responses API plus Conversations API as the replacement; Azure OpenAI Assistants retires the same day. Previously a managed agent framework with native tool use, code interpreter, file search, and persistent threads. Do not start new projects on it.

Last Evaluated: July 9, 2026
Official Website

Trust Vector Analysis

Dimension Breakdown

🚀Performance & Reliability
+
task completion accuracy

Based on underlying model performance

Evidence
OpenAI Documentation — Built on GPT-4 models with high task completion rates
highVerified: 2026-07-09
tool use reliability

Tool integration testing

Evidence
OpenAI Assistants Tools — Native support for function calling, code interpreter, and file search
highVerified: 2026-07-09
multi step planning

Complex task testing

Evidence
Community Testing — Good multi-step task execution via threads
mediumVerified: 2026-07-09
memory persistence

Memory system evaluation

Evidence
OpenAI Threads — Native thread persistence with message history
highVerified: 2026-07-09
error recovery

Error handling testing

Evidence
OpenAI Documentation — Automatic retries and error handling
mediumVerified: 2026-07-09
latency

Performance monitoring

Evidence
Community Reports — Latency depends on tools used and complexity
mediumVerified: 2026-07-09
🛡️Security
+
tool sandboxing

Security architecture review

Evidence
OpenAI Code Interpreter — Code execution in sandboxed environment
highVerified: 2026-07-09
access control

Access control testing

Evidence
OpenAI API Keys — API key-based authentication with project isolation
highVerified: 2026-07-09
prompt injection defense

Injection attack testing

Evidence
OpenAI Safety — System instructions separated from user messages
mediumVerified: 2026-07-09
data isolation

Data architecture review

Evidence
OpenAI Enterprise — Per-assistant data isolation
highVerified: 2026-07-09
🔒Privacy & Compliance
+
data retention

Privacy policy review

Evidence
OpenAI Data Usage — Thread data retained until deleted, not used for training (enterprise)
highVerified: 2026-07-09
gdpr compliance

Compliance documentation review

Evidence
OpenAI GDPR — GDPR compliant with data processing agreement
highVerified: 2026-07-09
file handling security

File security testing

Evidence
OpenAI File API — Encrypted file storage with access controls
highVerified: 2026-07-09
👁️Trust & Transparency
+
documentation quality

Documentation completeness review

Evidence
OpenAI Docs — Comprehensive documentation with examples
highVerified: 2026-07-09
execution traceability

Logging capabilities assessment

Evidence
OpenAI Runs — Run steps logged with status tracking
mediumVerified: 2026-07-09
decision explainability

Explainability features assessment

Evidence
OpenAI Assistants — Limited native explainability, relies on model responses
mediumVerified: 2026-07-09
⚙️Operational Excellence
+
ease of integration

Integration complexity assessment

Evidence
OpenAI SDKs — Official SDKs for Python, Node.js, and REST API
OpenAI API Deprecations — Assistants API deprecated with sunset date 2026-08-26; replacement is the Responses API + Conversations API
OpenAI Developer Community - Assistants API beta deprecation — Sunset remains on schedule for 2026-08-26 with no extension or degraded mode; Azure OpenAI Assistants API retires the same date
highVerified: 2026-07-09
scalability

Scalability testing

Evidence
OpenAI Platform — Scales with API tier, enterprise support available
highVerified: 2026-07-09
cost predictability

Pricing model analysis

Evidence
OpenAI Pricing — Token-based pricing, additional costs for tools and storage
highVerified: 2026-07-09
monitoring capabilities

Monitoring features assessment

Evidence
OpenAI Usage Dashboard — Usage tracking and cost monitoring
highVerified: 2026-07-09
Strengths
  • +Native tool integration (function calling, code interpreter, file search)
  • +Persistent thread management for stateful conversations
  • +Excellent documentation and SDK support
  • +Managed infrastructure (no server maintenance)
  • +Built on powerful GPT-4 models
  • +Good scalability with enterprise support
Limitations
  • !Higher costs compared to custom agent implementations
  • !Limited control over agent execution flow
  • !Latency can be high for complex multi-tool operations
  • !Vendor lock-in to OpenAI platform
  • !Limited native explainability features
  • !Code interpreter limited to Python only
  • !Deprecated: sunset scheduled for 2026-08-26 (verified on track as of 2026-07-09); migrate to the Responses API + Conversations API immediately
Metadata
license: Proprietary
supported models
0: GPT-4o
1: GPT-4 Turbo
2: GPT-4
3: GPT-3.5 Turbo
programming languages
0: Python
1: Node.js
2: REST API
deployment type: Managed cloud service
tool support
0: Function calling
1: Code Interpreter
2: File Search
max files per assistant: 10000
max file size: 512 MB
pricing: Token-based (model pricing) + $0.03/session for Code Interpreter + $0.10/GB/day for File Search (first GB free)
deprecation notice: Deprecated: sunset on 2026-08-26. Replaced by the Responses API + Conversations API.

Use Case Ratings

customer support

Excellent for stateful support conversations with file handling

code generation

Code interpreter enables powerful code execution and analysis

research assistant

File search tool ideal for document analysis

data analysis

Code interpreter excellent for data analysis workflows

content creation

Good for iterative content creation with memory

education

Persistent threads ideal for personalized tutoring

healthcare

HIPAA-eligible, but limited specialized medical tools

financial analysis

Good security, but requires careful tool access control

legal compliance

File search tool useful for contract analysis

creative writing

Thread persistence good for iterative brainstorming

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