GPT-5.5 vs Mixtral 8x7B
GPT-5.5 (2026) and Mixtral 8x7B (2023) are frontier reasoning models from OpenAI and MistralAI. GPT-5.5 ships a 1.05m-token context window, while Mixtral 8x7B ships a 32k-token context window. On Google-Proof Q&A, GPT-5.5 leads by 38.8 pts. On pricing, GPT-5.5 ranges from $5 to $8/1M input tokens by tier; Mixtral 8x7B costs $0.15/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.5 fits 33x more tokens; pick it for long-context work and Mixtral 8x7B for tighter calls.
Decision scorecard
Local evidence first| Signal | GPT-5.5 | Mixtral 8x7B |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding and Classification |
| Context window | 1.05m | 32k |
| Cheapest output | $30/1M tokens | $0.45/1M tokens |
| Provider routes | 4 tracked | 18 tracked |
| Shared benchmarks | Google-Proof Q&A leader | 3 shared |
Decision tradeoffs
- GPT-5.5 holds a shared-benchmark lead on Google-Proof Q&A, ahead by 38.8 points.
- GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags GPT-5.5 for Coding, RAG, and Agents.
- Mixtral 8x7B has the lower cheapest tracked output price at $0.45/1M tokens.
- Mixtral 8x7B has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Mixtral 8x7B for Coding and Classification.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-5.5
$11,500
Cheapest tracked route/tier: OpenAI API 0-272K input tokens
Mixtral 8x7B
$233
Cheapest tracked route/tier: Mistral AI Studio
Estimated monthly gap: $11,268. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- Mixtral 8x7B is $29.55/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- GPT-5.5 is $29.55/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.5 adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-23 | 2023-12-11 |
| Context window | 1.05m | 32k |
| Parameters | — | 8x7B |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | Apache 2.0OSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-12 | 2023-12 |
Pricing and availability
| Pricing attribute | GPT-5.5 | Mixtral 8x7B |
|---|---|---|
| Input price |
| $0.15/1M tokens |
| Output price |
| $0.45/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.5 | Mixtral 8x7B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | GPT-5.5 | Mixtral 8x7B |
|---|---|---|
| Google-Proof Q&A | 93.6 | 54.8 |
| HumanEval | 94.2 | 80.5 |
| Massive Multitask Language Understanding | 92.4 | 80.2 |
Continue comparing
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Last reviewed: 2026-07-11. Data sourced from public model cards and provider documentation.