# GPT-6.1 Sol vs GPT-6 Sol

> Markdown mirror of https://router.one/models/compare/gpt-6-1-sol-vs-gpt-6-sol for AI assistants and crawlers. Router One is a unified, OpenAI-compatible LLM API gateway.

GPT-6.1 Sol and GPT-6 Sol come to the same total on Router One at base-tier rates (GPT-6.1 Sol and GPT-6 Sol: request input ≤ 272,000 tokens) for a 1M-input + 1M-output mix ($2.40), with matching input and output rates. Their cached-input rates differ: GPT-6.1 Sol $0.02 vs GPT-6 Sol $0.04 per 1M tokens. Both carry a 1.05M context window. Both answer on /v1/chat/completions and /v1/responses (Codex CLI).

GPT-6.1 Sol and GPT-6 Sol compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.

## GPT-6.1 Sol vs GPT-6 Sol: rates, context window, and capabilities

| Spec | GPT-6.1 Sol | GPT-6 Sol |
| --- | --- | --- |
| Input / 1M tokens | $0.40 | $0.40 |
| Output / 1M tokens | $2.00 | $2.00 |
| Cached input / 1M tokens | $0.02 | $0.04 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Not in any plan — wallet |
| Detail page | [GPT-6.1 Sol](https://router.one/models/gpt-6-1-sol) | [GPT-6 Sol](https://router.one/models/gpt-6-sol) |

GPT-6.1 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.04 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.

GPT-6 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.04 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.08 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.

## What does 1M tokens cost on GPT-6.1 Sol vs GPT-6 Sol?

Base-tier rates: For a workload of 1M input plus 1M output tokens at current rates, GPT-6.1 Sol and GPT-6 Sol both come to $2.40, but their cached-input rates differ (see the table above), so the gap grows with the share of cached input in your requests. Context window and listed capabilities match, so compare them on your own prompts in your request traces.

## Switch between GPT-6.1 Sol and GPT-6 Sol

The API key, base URL and endpoints stay the same, but GPT-6 Sol code may still need changes. Per OpenAI's GPT-6 guide (checked 2026-10-01), GPT-6.1 Sol does not accept the none reasoning effort (OpenAI suggests low), so the temperature, top_p and logprobs settings that GPT-6 Sol takes only at none have to go; and GPT-6.1 Sol takes tool calls only on the Responses API, while GPT-6 Sol also supports function calling on Chat Completions at none. Send tool-using requests to /v1/responses. As of the 2026-10-01 plan response, neither model is in a plan tier, so both bill the wallet per token. The GPT-6.1 Sol API guide covers the rest of the migration.

`compare.sh`

```bash
curl https://api.router.one/v1/chat/completions \
  -H "Authorization: Bearer sk-your-router-one-key" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-6.1-sol", "messages": [{"role": "user", "content": "Hello"}]}'

# Same request, other model — change one string:
#   "model": "openai/gpt-6-sol"
```

## FAQ

### Is GPT-6.1 Sol cheaper than GPT-6 Sol?

Compared at base-tier rates (GPT-6.1 Sol and GPT-6 Sol: request input ≤ 272,000 tokens). Input: GPT-6.1 Sol $0.40 vs GPT-6 Sol $0.40 / 1M tokens; the rates are equal. Output: GPT-6.1 Sol $2.00 vs GPT-6 Sol $2.00 / 1M tokens; the rates are equal. Cached input: GPT-6.1 Sol $0.02 vs GPT-6 Sol $0.04 / 1M tokens; GPT-6.1 Sol has the lower rate. Total cost depends on the workload's input, output and cache usage. GPT-6.1 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.04 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. GPT-6 Sol: request input ≤ 272,000 tokens: Input $0.40 / 1M tokens, Output $2.00 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.04 / 1M tokens; request input > 272,000 tokens: Input $0.80 / 1M tokens, Output $3.00 / 1M tokens, Cache write $1.00 / 1M tokens, Cached input $0.08 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. Rates change; the /models page is the live source of truth.

### Is GPT-6.1 Sol or GPT-6 Sol included in a Router One subscription?

Neither GPT-6.1 Sol nor GPT-6 Sol is in a Router One plan, so every call to either bills the wallet per token.

### Can I switch between GPT-6.1 Sol and GPT-6 Sol without changing code?

The API key, base URL and endpoints stay the same, but GPT-6 Sol code may still need changes. Per OpenAI's GPT-6 guide (checked 2026-10-01), GPT-6.1 Sol does not accept the none reasoning effort (OpenAI suggests low), so the temperature, top_p and logprobs settings that GPT-6 Sol takes only at none have to go; and GPT-6.1 Sol takes tool calls only on the Responses API, while GPT-6 Sol also supports function calling on Chat Completions at none. Send tool-using requests to /v1/responses. As of the 2026-10-01 plan response, neither model is in a plan tier, so both bill the wallet per token. The GPT-6.1 Sol API guide covers the rest of the migration.

### Where do these numbers come from?

Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology. Rates on this page were read from the live catalog on 2026-10-01 (UTC) and refresh within the hour.

## More comparisons

- [GPT-6 Sol vs GPT-5.6 Sol](https://router.one/models/compare/gpt-6-sol-vs-gpt-5-6-sol)
- [GPT-6 Sol vs Claude Sonnet 5](https://router.one/models/compare/gpt-6-sol-vs-claude-sonnet-5)
- [Claude Opus 5.5 vs GPT-6 Sol](https://router.one/models/compare/claude-opus-5-5-vs-gpt-6-sol)
- [GPT-6.1 Sol vs GPT-6 Astra](https://router.one/models/compare/gpt-6-1-sol-vs-gpt-6-astra)

## See also

- Canonical page: https://router.one/models/compare/gpt-6-1-sol-vs-gpt-6-sol
- All model comparisons: https://router.one/models/compare
- All models & prices: https://router.one/models (markdown: https://router.one/models.md)
- Pricing: https://router.one/pricing
- GPT API access: https://router.one/cheap-gpt-api
- GPT-6.1 Sol API guide: https://router.one/blog/gpt-6-1-sol-api-guide
- GPT-6 Sol API guide: https://router.one/blog/gpt-6-sol-api-guide
- GPT-6 Sol in Codex CLI, Cursor, Cline and OpenCode: https://router.one/blog/gpt-6-sol-coding-tools-setup
- Cost calculator: https://router.one/llm-cost-calculator
- Pricing methodology: https://router.one/pricing-methodology