AI models
GPT-6.1 Sol
An OpenAI model accepting text and images and producing text.
- Price
- Usage-based API pricing
- Checked
- Oct 18, 2026
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AI models and language models
Compare exact model identities, documented inputs, context limits and token rates. Provider documentation is not an independent quality benchmark.
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AI models
Claude Sonnet 5.5
An Anthropic Claude model with text and image inputs and text output.
- Price
- Usage-based API pricing
- Checked
- Oct 18, 2026
AI models
Gemini 3.8 Flash
A Google Gemini model accepting text, images, video, audio and PDFs, with text output.
- Price
- Usage-based API pricing
- Checked
- Oct 18, 2026
Compare the source evidence
| Requirement | GPT-6.1 Sol | Claude Sonnet 5.5 | Gemini 3.8 Flash |
|---|---|---|---|
| Pricing | Usage-based API pricing | Usage-based API pricing | Usage-based API pricing |
| Who it is for | An OpenAI model accepting text and images and producing text. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | An Anthropic Claude model with text and image inputs and text output. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | A Google Gemini model accepting text, images, video, audio and PDFs, with text output. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Coverage limits | The 1,050,000-token context window and 128,000-token output ceiling are different limits. Long prompts and premium service tiers change token rates. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | The standard output ceiling is 128K tokens; the documented 300K batch option requires a separate beta header. Thinking and tool behavior are model-specific. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | The documented input limit is 1,048,576 tokens and output limit is 65,536. The standard paid rates shown here expire after 31 December 2026. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Provider | OpenAI Provider identity is linked to the separate OpenAI API catalogue entry. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | Anthropic Provider identity is linked to the separate Anthropic Claude API entry. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | Google Provider identity is linked to the separate Google Gemini API entry. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| API model identifier | gpt-6.1-sol Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | claude-sonnet-5-5 Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | gemini-3.8-flash Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Modalities | Text and image input; text output Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | Text and image input; text output Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | Text, image, video, audio and PDF input; text output Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Context window | 1,050,000 tokens in the context window Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | 1M tokens in the context window Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | 1,048,576 input tokens (not a shared context-window measurement) Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Maximum output | 128,000 output tokens Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | 128K output tokens (standard API) Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | 65,536 output tokens Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Input token rate | 2 USD per million input tokens Standard uncached text input for prompts up to 272K input tokens. Longer prompts: 2x input/cache and 1.5x output for the full request. Fast 2x, Ultrafast 6x; regional processing adds 10% where available. Cache writes, tools and tax are additional scopes. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | 2 USD per million base input tokens Standard base input rate for Claude Sonnet 5.5. Prompt cache writes/reads and batch processing have separate rates; tools, service tier and taxes can change the total. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | 0.75 USD per million input tokens Gemini 3.8 Flash Standard paid tier through 31 December 2026; USD 1.50 from 1 January 2027. Cache storage, grounding, other service tiers and taxes are separate. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Output token rate | 10 USD per million output tokens Standard text output for prompts up to 272K input tokens. Above 272K input tokens: 1.5x output rate. Fast, Ultrafast, regional processing, tools and tax can change the total. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | 10 USD per million output tokens Standard output rate for Claude Sonnet 5.5. Compare the exact consumption option; the batch discount is separate. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | 3.75 USD per million output tokens, including thinking Gemini 3.8 Flash Standard paid tier through 31 December 2026; USD 7.50 from 1 January 2027. Other service tiers, cache storage, grounding and taxes are separate. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Availability | Listed for paid API usage tiers; Free tier is not supported. Published rate-limit table, not a verification of regional eligibility or access for a particular account. Verified Oct 18, 2026 · GPT-6.1 Sol: official API documentation | Active model; released 28 September 2026. Vendor lifecycle status checked on 18 October 2026; account and platform eligibility require confirmation. Verified Oct 18, 2026 · Claude Sonnet 5.5: official API documentation | Stable model alias; documentation lists a September 2026 update. Documentation status, not an account-specific access guarantee. Verified Oct 18, 2026 · Gemini 3.8 Flash: official API documentation |
| Coverage note | Official documentation checked on 18 October 2026; no hands-on test. | Official documentation checked on 18 October 2026; no hands-on test. | Official documentation checked on 18 October 2026; no hands-on test. |