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GPT 6 Astra vs Step 3.5 Flash

At a glance

OpenAI's new flagship for demanding end-to-end work: advanced analysis, software engineering, deep research, scientific work, and document creation.

1.1M ctx$10.00/$50.00 per M

StepFun's fast and efficient language model.

262K ctx$0.10/$0.30 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper99%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
262K
Context
66K
Max output
Jan 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input99%$0.10/M tokens
Output99%$0.30/M tokens
Chat with GPT 6 AstraGo to model
Chat with Step 3.5 FlashGo to model
Frequently Asked Questions: GPT 6 Astra vs Step 3.5 Flash▼

Which is better, GPT 6 Astra or Step 3.5 Flash?

▼

Both GPT 6 Astra and Step 3.5 Flash are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 6 Astra or Step 3.5 Flash?

▼

Step 3.5 Flash has a lower blended cost. GPT 6 Astra: $10.00 input / $50.00 output. Step 3.5 Flash: $0.10 input / $0.30 output.

Which has a larger context window, GPT 6 Astra or Step 3.5 Flash?

▼

GPT 6 Astra has a larger context window: GPT 6 Astra supports 1.1M tokens vs Step 3.5 Flash at 262K tokens.

Do both GPT 6 Astra and Step 3.5 Flash support vision?

▼

GPT 6 Astra supports vision/image input, but Step 3.5 Flash does not.

What are the key differences between GPT 6 Astra and Step 3.5 Flash?

▼

Key differences: Step 3.5 Flash is significantly cheaper; only GPT 6 Astra supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 6 Astra and Step 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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